{"product_id":"furuno-fairing-block-for-165t-b54-ss54-dff3d","title":"Furuno Fairing Block for 165T-B54 \u0026 165T-SS54 Transducer","description":"\u003cp class=\"nvn-hero\"\u003eThis is the genuine Furuno fairing block for the 165T-B54 and 165T-SS54 thru-hull transducers on a DFF3D multibeam install. It sets the transducer face true to your hull and fairs the flow so your port-to-starboard picture holds together at speed. Ships with the anti-rotational bolt kit.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eIf you're running the Furuno DFF3D multibeam sounder with a 165T-B54 bronze or 165T-SS54 stainless thru-hull transducer, this is the fairing block that gets the transducer sitting right against your hull. It's the factory Furuno part, MPN AIR-033-719-01, and it ships with the anti-rotational bolt kit you need to lock the transducer down so it can't twist out of alignment.\u003c\/p\u003e\n\u003cp\u003eHere's why a fairing block matters, and why you don't want to skip it on a DFF3D install. The 165T transducer sees 120 degrees port to starboard. That wide multibeam picture is the whole point of the DFF3D, and it only looks right when the transducer face is pointed true. Most hulls have deadrise, meaning the bottom is angled, not flat. Bolt a thru-hull transducer straight through an angled hull and the beam ends up cocked off to one side. The fairing block is the wedge that sits between the hull and the transducer, taking up that angle so the face aims where it should.\u003c\/p\u003e\n\u003cp\u003eThe other job it does is flow. A bare thru-hull sticking down into the water trips up everything passing over it, and that turbulence shows up as noise and dropouts on the screen once you're up on plane. This block is shaped to fair the transducer into the hull so water slides past clean. That's the difference between a picture that holds together at cruise and one that hashes out the moment you push the throttle up.\u003c\/p\u003e\n\u003cp\u003eOne thing to know going in: this is an uncut fairing block. Furuno ships it oversized on purpose so it can be trimmed and faired to your specific hull deadrise during the install. You cut it to your hull's angle, bed it in a good marine sealant, and fair the trailing edge smooth so there's no step for water to catch on. It's a real install, not a bolt-on, and it's the kind of job that rewards taking your time. Get the block faired properly and the DFF3D pays you back with clean, stable returns.\u003c\/p\u003e\n\u003cp\u003eThe included anti-rotational bolt kit is not an afterthought. On a thru-hull, the nut wants to let the transducer spin as it's tightened, and a multibeam transducer that's rotated even a few degrees throws the whole port-starboard picture off. The kit keys the transducer so it stays put. Use it.\u003c\/p\u003e\n\u003cp\u003eThis block fits both the bronze 165T-B54 and the stainless 165T-SS54. Pick the transducer that matches your hull material and running conditions, the fairing block is the same part either way. It's a DFF3D-specific accessory, so if you're running the multibeam sounder this is the mount you want. If you're not sure whether your transducer is a pocket mount or a straight thru-hull on your boat, give us a call before you drill anything and we'll help you sort it out.\u003c\/p\u003e\n\u003cp\u003eWe sell a lot of DFF3D systems to sportfishers and center consoles that want the side-to-side coverage for structure and bait, and the fairing block is the part people forget to order until the transducer is in hand and they realize it won't sit flat. Order it with the transducer and save yourself the wait. At 3.25 pounds and about 15 inches long, it's a compact part, but it's the piece that makes the whole multibeam install come together right.\u003c\/p\u003e\n\u003cp\u003eFor the install itself, plan on the usual thru-hull toolkit. You'll want a hole saw sized to the transducer stem, a way to fair the block flush, quality marine bedding compound, and a helper to hold the transducer from inside while you snug the nut from below, or the other way around depending on how your boat is laid out. Dry-fit everything first. Check the beam is aimed straight down at rest and that the faired trailing edge is smooth before you commit any sealant. A little patience here saves a haul-out later.\u003c\/p\u003e\n\u003cp\u003eAnd because this is the genuine Furuno part, it carries the full Furuno warranty and it's dimensioned to match the 165T transducer body exactly. Shop-fabricated fairings can leave gaps that let water track along the transducer and kill your returns. This one seats the way the engineers intended. If you've already got the 165T-B54 or 165T-SS54 on the bench and you're staging a DFF3D install, add this to the box and you'll have everything you need to mount it right the first time.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eGenuine Furuno fairing block, MPN AIR-033-719-01, for the DFF3D multibeam sounder\u003c\/li\u003e\n  \u003cli\u003eFits both the 165T-B54 bronze and 165T-SS54 stainless thru-hull transducers\u003c\/li\u003e\n  \u003cli\u003eIncludes the anti-rotational bolt kit so the transducer can't twist out of alignment\u003c\/li\u003e\n  \u003cli\u003eUncut block, trim and fair it to your hull's exact deadrise for a flush fit\u003c\/li\u003e\n  \u003cli\u003eSets the transducer face true so the 120-degree port-to-starboard picture reads right\u003c\/li\u003e\n  \u003cli\u003eStreamlines water flow over the transducer to cut turbulence noise at cruising speed\u003c\/li\u003e\n  \u003cli\u003e3.25 lb and about 15 inches long, easy to bench-stage alongside the transducer\u003c\/li\u003e\n  \u003cli\u003eFactory-dimensioned to the 165T transducer body for a gap-free seat\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 Furuno 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 this fairing block actually do?\u003c\/summary\u003e\n    \u003cp\u003eTwo things. It takes up your hull's deadrise angle so the transducer face points true, and it fairs the transducer into the hull so water flows past clean. Together that keeps the DFF3D's port-to-starboard picture stable, especially once you're up on plane.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhich transducers does it fit?\u003c\/summary\u003e\n    \u003cp\u003eThe Furuno 165T-B54 bronze thru-hull and the 165T-SS54 stainless thru-hull. It's the same fairing block for either one.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhich sonar system is this for?\u003c\/summary\u003e\n    \u003cp\u003eThe Furuno DFF3D multibeam sounder. The 165T-B54 and 165T-SS54 are the thru-hull transducers built for the DFF3D, and this is their matching fairing block.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it come with mounting hardware?\u003c\/summary\u003e\n    \u003cp\u003eYes. It ships with the anti-rotational bolt kit, which keys the transducer so it can't spin as you tighten the nut. On a multibeam transducer, even a few degrees of rotation throws the picture off, so this kit matters.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs the fairing block pre-cut to my hull?\u003c\/summary\u003e\n    \u003cp\u003eNo. It's an uncut block, shipped oversized on purpose. You trim and fair it to your specific hull deadrise during the install, then bed it in marine sealant and smooth the trailing edge.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy can't I just bolt the transducer straight through the hull?\u003c\/summary\u003e\n    \u003cp\u003eBecause most hulls are angled, not flat. Mount a thru-hull straight through an angled bottom and the beam ends up cocked to one side, and the bare housing trips up water flow at speed. The fairing block fixes both.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it matter if I have the bronze or stainless transducer?\u003c\/summary\u003e\n    \u003cp\u003eNot for the fairing block. Pick the 165T-B54 or 165T-SS54 based on your hull material and running conditions. The fairing block is the same part for both.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I install this myself?\u003c\/summary\u003e\n    \u003cp\u003eIf you're comfortable with a thru-hull install, yes. Plan on cutting and fairing the block to your deadrise, bedding it in good marine sealant, and using the anti-rotational kit. Dry-fit and check the beam aims straight down before you commit any sealant. If you'd rather not drill, a marine electronics installer can handle it.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow big and heavy is it?\u003c\/summary\u003e\n    \u003cp\u003eIt's a compact part, roughly 15 inches long and about 3.25 pounds, small enough to stage on the bench with the transducer before you start the 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\u003eFuruno Fairing Block for 165T-B54 \u0026amp; 165T-SS54 Transducer\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eFuruno\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eAIR-033-719-01\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e611679374981\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e3.25 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePackage Dimensions (L x W x H)\u003c\/th\u003e\n\u003ctd\u003e15 x 4 x 4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eAccessory Type\u003c\/th\u003e\n\u003ctd\u003eThru-Hull Transducer Fairing Block\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCompatible Transducers\u003c\/th\u003e\n\u003ctd\u003eFuruno 165T-B54, 165T-SS54\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCompatible Sonar\u003c\/th\u003e\n\u003ctd\u003eFuruno DFF3D Multibeam\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMounting\u003c\/th\u003e\n\u003ctd\u003eThru-Hull\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFairing Type\u003c\/th\u003e\n\u003ctd\u003eUncut, faired to hull during install\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eIn The Box\u003c\/th\u003e\n\u003ctd\u003eFairing block, anti-rotational bolt kit\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 this fairing block actually do?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Two things. It takes up your hull's deadrise angle so the transducer face points true, and it fairs the transducer into the hull so water flows past clean. Together that keeps the DFF3D's port-to-starboard picture stable, especially once you're up on plane.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Which transducers does it fit?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The Furuno 165T-B54 bronze thru-hull and the 165T-SS54 stainless thru-hull. It's the same fairing block for either one.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Which sonar system is this for?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The Furuno DFF3D multibeam sounder. The 165T-B54 and 165T-SS54 are the thru-hull transducers built for the DFF3D, and this is their matching fairing block.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it come with mounting hardware?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. It ships with the anti-rotational bolt kit, which keys the transducer so it can't spin as you tighten the nut. On a multibeam transducer, even a few degrees of rotation throws the picture off, so this kit matters.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is the fairing block pre-cut to my hull?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. It's an uncut block, shipped oversized on purpose. You trim and fair it to your specific hull deadrise during the install, then bed it in marine sealant and smooth the trailing edge.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why can't I just bolt the transducer straight through the hull?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Because most hulls are angled, not flat. Mount a thru-hull straight through an angled bottom and the beam ends up cocked to one side, and the bare housing trips up water flow at speed. The fairing block fixes both.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it matter if I have the bronze or stainless transducer?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Not for the fairing block. Pick the 165T-B54 or 165T-SS54 based on your hull material and running conditions. The fairing block is the same part for both.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I install this myself?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"If you're comfortable with a thru-hull install, yes. Plan on cutting and fairing the block to your deadrise, bedding it in good marine sealant, and using the anti-rotational kit. Dry-fit and check the beam aims straight down before you commit any sealant. 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