{"product_id":"sierra-360604002-waste-water-tank-monitor-12-24v-dc","title":"Sierra 360604002 Waste Water Tank Monitor System","description":"\u003cp class=\"nvn-hero\"\u003eThe Sierra 360604002 is a tank monitor system for a single waste water holding tank. It reads the level through a sealed, non-vented probe cap and feeds a real number to your helm gauge. Runs on 12 or 24 volt DC, and it drops into an existing OEM sender spot for a clean swap.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eNobody wants to guess at a holding tank. Pump out too early and you've wasted a trip to the dock. Wait too long and you've got a problem nobody on the boat wants to deal with. The Sierra 360604002 tank monitor system takes the guessing out of it. It reads the level in a single waste water tank and gives you a real number to work with, so you know exactly where you stand before you leave the slip.\u003c\/p\u003e\n\u003cp\u003eThis is the non-vented version, built around a probe cap that seals the top of the tank. It's an OEM-style replacement, so if you're swapping out a failed sender on an existing setup, it drops into the same job. The probe reads through the depth of the tank and feeds a level signal you can wire to a gauge or panel at the helm. It runs on either 12 or 24 volt DC, so it fits just about any boat's house system without an adapter.\u003c\/p\u003e\n\u003cp\u003eWe see these go into cruisers and sailboats most often, on the black water holding tank that never seems to have a reliable gauge from the factory. If you've owned a boat with a marine head, you know the original tank sender is usually the first thing to quit. This is the fix. It's also a smart upgrade on a boat where you've added a holding tank and just want honest level readings instead of the tap-the-hull guessing game.\u003c\/p\u003e\n\u003cp\u003eWhat are you actually getting on the readout? A continuous level, not just a full-or-empty light. That matters on a waste tank more than almost anywhere else, because the useful information is in the middle. Knowing you're at half versus three-quarters is the difference between a relaxed weekend and a scramble to find a pump-out station on a Sunday afternoon. The probe measures across the depth of the tank and the system translates that into the reading your gauge shows.\u003c\/p\u003e\n\u003cp\u003eInstall is straightforward if you've done any tank work before. You mount the probe cap to the top of the tank, trim the probe down to match your tank's depth, and seal the cap so it's watertight. Then you run the signal and power leads back to your gauge. Take your time on the seal. A holding tank is the one place on the boat where a lazy gasket job will come back to haunt you. We'd also put an inline fuse on the power lead. That keeps a voltage spike at engine start from scrambling a reading.\u003c\/p\u003e\n\u003cp\u003eA couple of honest notes. Waste tanks are hard on any sensor, and black water is harder than gray. Plan on pulling the probe once a season for a clean and a soak, and it'll keep reading true for years. If your tank is rectangular with internal baffles, check that the probe drops clean to the bottom before you seal everything up. A little planning here saves you a redo down the road.\u003c\/p\u003e\n\u003cp\u003eWho's this not for? If you're looking to monitor a fuel or fresh water tank, this particular unit is set up for a waste holding tank with the non-vented cap. And it measures one tank. If you're running multiple tanks, you'd want a monitor per tank or a multi-tank panel. For a single black water tank on a cruiser, a sailboat, or a center console with an enclosed head, though, this is exactly the right tool.\u003c\/p\u003e\n\u003cp\u003eBottom line, this is the part that turns \"I think we're okay\" into \"we've got room, let's stay out another night.\" A working tank monitor is one of the cheapest quality-of-life upgrades you can put on a cruising boat. And Sierra builds their marine gear to hold up in salt air, so you won't be back here in a season looking for another one.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eMonitors a single waste water holding tank so you always know your level before leaving the dock\u003c\/li\u003e\n  \u003cli\u003eNon-vented probe cap seals the top of the tank for a clean, closed installation\u003c\/li\u003e\n  \u003cli\u003eRuns on 12 or 24 volt DC, fits nearly any boat's house electrical system\u003c\/li\u003e\n  \u003cli\u003eOEM-style replacement that drops into an existing tank sender location\u003c\/li\u003e\n  \u003cli\u003eProbe trims to match your tank depth for an accurate full-to-empty reading\u003c\/li\u003e\n  \u003cli\u003eContinuous level output feeds a helm gauge or panel, not just a full or empty light\u003c\/li\u003e\n  \u003cli\u003eBlack housing built to hold up in the marine environment and salt air\u003c\/li\u003e\n  \u003cli\u003eServiceable probe pulls for seasonal cleaning to keep readings accurate over the years\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 Sierra Marine 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 Sierra 360604002 monitor?\u003c\/summary\u003e\n    \u003cp\u003eIt reads the level in a single waste water holding tank and gives you a continuous reading, not just a full or empty light. You wire the signal to a compatible tank gauge or monitor panel at the helm.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the difference between the vented and non-vented version?\u003c\/summary\u003e\n    \u003cp\u003eThis is the non-vented version. Its probe cap seals the top of the tank. Sierra offers a vented cap variant as well, so match the cap to how your holding tank is set up for venting.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it work on 12 or 24 volt systems?\u003c\/summary\u003e\n    \u003cp\u003eBoth. It runs on 12 or 24 volt DC, so it works with just about any boat's house electrical system without an adapter.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use it on a fresh water or fuel tank?\u003c\/summary\u003e\n    \u003cp\u003eThis particular unit is set up for a waste holding tank with a non-vented cap, and it measures one tank. For a fresh water or fuel tank you'd want the sender built for that job.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this an OEM replacement?\u003c\/summary\u003e\n    \u003cp\u003eYes. It's an OEM-style replacement, so if you're swapping a failed sender on an existing setup it drops into the same location.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I install it?\u003c\/summary\u003e\n    \u003cp\u003eMount the probe cap to the top of the tank, trim the probe to match your tank's depth, and seal the cap watertight. Then run the power and signal leads back to your gauge. Take your time on the seal, and put an inline fuse on the power lead.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill it show a partial level or just full and empty?\u003c\/summary\u003e\n    \u003cp\u003eIt reads a continuous level across the depth of the tank, so you can see half versus three-quarters, not just full or empty. That's the useful information on a waste tank.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I keep it reading accurately over time?\u003c\/summary\u003e\n    \u003cp\u003eWaste tanks are hard on any sensor. Plan on pulling the probe about once a season for a clean and a soak, and it'll keep reading true for years.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it include the gauge?\u003c\/summary\u003e\n    \u003cp\u003eThis listing is the tank monitor sensing system with the non-vented probe cap. You connect it to a compatible helm gauge or monitor panel to display the level.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat color is it?\u003c\/summary\u003e\n    \u003cp\u003eBlack.\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\u003eSierra 360604002 Waste Water Tank Monitor System\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSierra Marine\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e360604002\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e713814066598\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eTank Level Monitor System\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTank Monitored\u003c\/th\u003e\n\u003ctd\u003eWaste \/ Holding Water Tank\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTanks Measured\u003c\/th\u003e\n\u003ctd\u003eSingle Tank\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSensor Style\u003c\/th\u003e\n\u003ctd\u003eTank Probe with Cap\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProbe Cap\u003c\/th\u003e\n\u003ctd\u003eNon-Vented\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOperating Voltage\u003c\/th\u003e\n\u003ctd\u003e12 \/ 24 Volts DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFitment\u003c\/th\u003e\n\u003ctd\u003eOEM Replacement\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 Sierra 360604002 monitor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It reads the level in a single waste water holding tank and gives you a continuous reading, not just a full or empty light. You wire the signal to a compatible tank gauge or monitor panel at the helm.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the difference between the vented and non-vented version?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"This is the non-vented version. Its probe cap seals the top of the tank. Sierra offers a vented cap variant as well, so match the cap to how your holding tank is set up for venting.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it work on 12 or 24 volt systems?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Both. It runs on 12 or 24 volt DC, so it works with just about any boat's house electrical system without an adapter.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I use it on a fresh water or fuel tank?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"This particular unit is set up for a waste holding tank with a non-vented cap, and it measures one tank. For a fresh water or fuel tank you'd want the sender built for that job.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this an OEM replacement?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. It's an OEM-style replacement, so if you're swapping a failed sender on an existing setup it drops into the same location.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I install it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Mount the probe cap to the top of the tank, trim the probe to match your tank's depth, and seal the cap watertight. Then run the power and signal leads back to your gauge. Take your time on the seal, and put an inline fuse on the power lead.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will it show a partial level or just full and empty?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It reads a continuous level across the depth of the tank, so you can see half versus three-quarters, not just full or empty. That's the useful information on a waste tank.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I keep it reading accurately over time?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Waste tanks are hard on any sensor. Plan on pulling the probe about once a season for a clean and a soak, and it'll keep reading true for years.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it include the gauge?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"This listing is the tank monitor sensing system with the non-vented probe cap. 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