{"product_id":"camco-10493-water-heater-t-p-relief-valve-3-4in-npt","title":"Camco 10493 Water Heater T\u0026P Relief Valve, 3\/4in NPT","description":"\u003cp class=\"nvn-hero\"\u003eThe Camco 10493 is the temperature and pressure relief valve that keeps your RV or boat water heater safe. When tank pressure climbs past its set point or the water gets too hot, this valve opens and vents before anything gets dangerous. Brass body, stainless steel spring, and a 4-inch epoxy-coated probe on an extended 2-1\/2-inch shank, all rated to 150 PSI.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eYour water heater is a sealed tank full of water that gets hot, and hot water expands. On an RV or a boat, that tank lives through vibration, temperature swings, and years of hard use. The temperature and pressure relief valve is the one part standing between normal operation and a tank that builds pressure with nowhere to go. The Camco 10493 is that valve. It's a straightforward brass safety device that threads into the relief port on most RV and marine water heaters and opens automatically the moment temperature or pressure crosses a safe limit.\u003c\/p\u003e\n\u003cp\u003eHere's how it works. The valve carries a 150 PSI pressure rating and a temperature probe that reaches 4 inches into the tank. If the water pressure climbs past the valve's set point, or the water temperature spikes, the internal stainless steel spring gives way and the valve vents. That relieves the tank before pressure can build to the point of damage. When conditions drop back to normal, the valve reseats and holds. It's a simple mechanism, and simple is exactly what you want in a safety part.\u003c\/p\u003e\n\u003cp\u003eThe body is brass, which is the right material for a fitting that sees hot water year after year. Brass handles heat and resists corrosion far better than plated steel, and it won't get brittle the way cheaper materials do. The probe is epoxy-coated, so the part that sits down in the tank water stays protected against scale and corrosion. And the spring is stainless steel, not plain wire that rusts and loses tension. Those three material choices are why a valve like this outlasts the bargain replacements.\u003c\/p\u003e\n\u003cp\u003eFitment comes down to three numbers. The valve size is 3\/4-inch NPT, which is the standard relief port thread on the vast majority of RV and marine water heaters. The shank is 2-1\/2 inches, an extended length that reaches through thicker tank walls and insulation so the threads seat properly. And the probe is 4 inches, sized to sit in the water where it can actually sense tank temperature. Before you buy, check your old valve against those three dimensions. If your existing relief valve is a 3\/4-inch NPT with a similar shank and probe, this drops right in.\u003c\/p\u003e\n\u003cp\u003eWhen should you replace a T\u0026amp;P valve? A few clear signs. If it weeps or drips constantly, the seat is worn and it's not sealing. If it's crusted with mineral scale or shows corrosion around the body, it's past its service life. If you lift the test lever and no water comes out, the valve is stuck and it isn't protecting you at all, which is the most dangerous failure of the bunch. Most techs will tell you a relief valve is a wear part. Replacing it during a water heater service or at the start of a season is cheap insurance.\u003c\/p\u003e\n\u003cp\u003eInstallation is within reach for most owners. Shut off the water heater and the water supply, let the tank cool, and relieve the pressure before you touch anything. Drain enough water to get below the valve port. Back out the old valve, clean the threads, wrap the new valve's threads with PTFE tape or pipe dope, and thread the 10493 in until it's snug and the discharge outlet points where you want it. Reconnect any discharge tube, refill the tank, and check for leaks before you fire the heater back up. If you're not comfortable working around a pressurized hot water system, hand it to a tech. There's no shame in that.\u003c\/p\u003e\n\u003cp\u003eOne note on what this is and isn't. This is a replacement safety valve, not a tank, an element, or a thermostat. It doesn't heat water and it doesn't regulate normal operating temperature. Its whole job is to open when something goes wrong. That's it. The English and French packaging makes it easy to source on both sides of the border, which is handy if you cruise or travel into Canada. Match the thread, the shank, and the probe against your old valve, and you've got a proven Camco safety part ready to go back to work.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e150 PSI pressure rating opens the valve before tank pressure can climb to a damaging level\u003c\/li\u003e\n  \u003cli\u003e3\/4-inch NPT valve size fits the standard relief port on most RV and marine water heaters\u003c\/li\u003e\n  \u003cli\u003e2-1\/2-inch extended shank reaches through thicker tank walls and insulation for a proper thread seat\u003c\/li\u003e\n  \u003cli\u003e4-inch epoxy-coated probe sits down in the tank water to sense true temperature and resist scale\u003c\/li\u003e\n  \u003cli\u003eBrass body handles years of hot water and resists corrosion better than plated steel\u003c\/li\u003e\n  \u003cli\u003eStainless steel spring keeps its tension and won't rust like plain steel wire\u003c\/li\u003e\n  \u003cli\u003eEnglish and French packaging makes it easy to source in both the US and Canada\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Camco reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does the Camco 10493 do?\u003c\/summary\u003e\n    \u003cp\u003eIt's a temperature and pressure relief valve, a safety device for a water heater. If the water in the tank gets too hot or the pressure climbs past the valve's set point, it opens and vents to relieve the tank. When conditions return to normal, it reseats and holds. Its whole job is to protect the tank from over-pressure.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat size is this valve?\u003c\/summary\u003e\n    \u003cp\u003eThe valve size is 3\/4-inch NPT, which is the standard relief port thread on the vast majority of RV and marine water heaters. Check your old valve to confirm before you order.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the pressure rating?\u003c\/summary\u003e\n    \u003cp\u003eIt's rated to 150 PSI. The valve is built to vent before tank pressure reaches a level that could damage the tank.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow long are the probe and the shank?\u003c\/summary\u003e\n    \u003cp\u003eThe probe is 4 inches, sized to reach down into the tank water where it can sense true temperature. The shank is 2-1\/2 inches, an extended length so the threads reach through thicker tank walls and insulation and seat properly.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the valve made of?\u003c\/summary\u003e\n    \u003cp\u003eThe body is brass, the spring is stainless steel, and the probe is epoxy-coated. Brass handles hot water and resists corrosion, the stainless spring keeps its tension without rusting, and the epoxy coating protects the probe against scale.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill it fit my RV or marine water heater?\u003c\/summary\u003e\n    \u003cp\u003eIt fits any water heater with a 3\/4-inch NPT relief port that takes a 2-1\/2-inch shank and a 4-inch probe, which covers most RV and marine units. The safest check is to compare it against the valve you're replacing. If the thread, shank, and probe match, it drops in.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy is my old relief valve leaking or dripping?\u003c\/summary\u003e\n    \u003cp\u003eA relief valve that weeps or drips constantly usually has a worn seat that's no longer sealing, or it's reacting to a real pressure or thermal expansion problem in the system. Either way, a valve that keeps dripping is telling you it's time to look at it. A relief valve is a wear part, so replacement is common.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know when to replace a T\u0026amp;P valve?\u003c\/summary\u003e\n    \u003cp\u003eReplace it if it weeps or drips constantly, if it's crusted with scale or shows corrosion around the body, or if you lift the test lever and no water comes out. A valve that won't open on the lever is stuck and isn't protecting you, which is the most dangerous failure. Many owners replace it as routine insurance during a water heater service.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I install it?\u003c\/summary\u003e\n    \u003cp\u003eShut off the water heater and water supply, let the tank cool, and relieve the pressure first. Drain enough water to get below the valve port, back out the old valve, clean the threads, and wrap the new valve with PTFE tape or pipe dope. Thread the 10493 in until it's snug with the outlet pointed where you want it, reconnect any discharge tube, refill, and check for leaks before firing the heater. If you're not comfortable working around a pressurized hot water system, hand it to a tech.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes this valve come with thread sealant?\u003c\/summary\u003e\n    \u003cp\u003eNo, the 10493 is the valve only. Plan to have PTFE thread tape or pipe dope on hand to seal the NPT threads during install.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eCamco 10493 Water Heater Temperature and Pressure Relief Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eCamco\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e10493\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e014717104937\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eValve Type\u003c\/th\u003e\n\u003ctd\u003eTemperature and Pressure Relief Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eValve Size\u003c\/th\u003e\n\u003ctd\u003e3\/4 Inch NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eShank Length\u003c\/th\u003e\n\u003ctd\u003e2-1\/2 Inch\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePressure Rating\u003c\/th\u003e\n\u003ctd\u003e150 PSI\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProbe Length\u003c\/th\u003e\n\u003ctd\u003e4 Inch\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProbe Coating\u003c\/th\u003e\n\u003ctd\u003eEpoxy-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBody Material\u003c\/th\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpring Material\u003c\/th\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePackaging Language\u003c\/th\u003e\n\u003ctd\u003eEnglish and French\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does the Camco 10493 do?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's a temperature and pressure relief valve, a safety device for a water heater. If the water in the tank gets too hot or the pressure climbs past the valve's set point, it opens and vents to relieve the tank. When conditions return to normal, it reseats and holds. Its whole job is to protect the tank from over-pressure.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What size is this valve?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The valve size is 3\/4-inch NPT, which is the standard relief port thread on the vast majority of RV and marine water heaters. Check your old valve to confirm before you order.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the pressure rating?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's rated to 150 PSI. The valve is built to vent before tank pressure reaches a level that could damage the tank.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How long are the probe and the shank?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The probe is 4 inches, sized to reach down into the tank water where it can sense true temperature. The shank is 2-1\/2 inches, an extended length so the threads reach through thicker tank walls and insulation and seat properly.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the valve made of?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The body is brass, the spring is stainless steel, and the probe is epoxy-coated. Brass handles hot water and resists corrosion, the stainless spring keeps its tension without rusting, and the epoxy coating protects the probe against scale.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will it fit my RV or marine water heater?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It fits any water heater with a 3\/4-inch NPT relief port that takes a 2-1\/2-inch shank and a 4-inch probe, which covers most RV and marine units. The safest check is to compare it against the valve you're replacing. If the thread, shank, and probe match, it drops in.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why is my old relief valve leaking or dripping?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"A relief valve that weeps or drips constantly usually has a worn seat that's no longer sealing, or it's reacting to a real pressure or thermal expansion problem in the system. Either way, a valve that keeps dripping is telling you it's time to look at it. A relief valve is a wear part, so replacement is common.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I know when to replace a T\u0026P valve?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Replace it if it weeps or drips constantly, if it's crusted with scale or shows corrosion around the body, or if you lift the test lever and no water comes out. A valve that won't open on the lever is stuck and isn't protecting you, which is the most dangerous failure. Many owners replace it as routine insurance during a water heater service.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I install it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Shut off the water heater and water supply, let the tank cool, and relieve the pressure first. Drain enough water to get below the valve port, back out the old valve, clean the threads, and wrap the new valve with PTFE tape or pipe dope. Thread the 10493 in until it's snug with the outlet pointed where you want it, reconnect any discharge tube, refill, and check for leaks before firing the heater. If you're not comfortable working around a pressurized hot water system, hand it to a tech.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does this valve come with thread sealant?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No, the 10493 is the valve only. Plan to have PTFE thread tape or pipe dope on hand to seal the NPT threads during install.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Camco","offers":[{"title":"Default Title","offer_id":45078834774109,"sku":"2009928","price":23.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_fffa2432-0f91-4961-8cb9-bfa5514233a2.png?v=1789945218","url":"https:\/\/nvnmarine.com\/products\/camco-10493-water-heater-t-p-relief-valve-3-4in-npt","provider":"NVN Marine","version":"1.0","type":"link"}