When you are working on a marine pump, plumbing, or sanitation system and need a seacock, the first question is usually whether the connection will line up with your existing setup. The Groco FBV-Series 3" NPS Flange to 3" NPTF Bronze Seacock is a precise answer to that question, with a listed price of USD 605.85.
Quick Verdict
This seacock is built for one specific flange-to-thread transition, so the material choice gives you a durable component for below-deck service. If that transition matches your through-hull and piping arrangement, it is a direct fit. If your system uses a different connection standard, this is not the part to force into place.
Who It Suits
Boat owners and builders who need a replacement seacock where the hull side uses a flanged connection and the pipe side is threaded. It also suits anyone who prefers metal construction for a marine environment where corrosion resistance matters.
What Stands Out from the Listed Details
The connection configuration is stated directly in the product name, leaving no confusion about the geometry you are ordering. The Groco name appears in the product title, and the part number is listed as FBV-3000. The listing also includes an interchange part number of 34-FBV3000, which can help when cross-referencing during a replacement job.
Meaningful Trade-Offs
The fixed nature of this seacock is both its strength and its limitation. You get a direct transition without needing extra reducers, but both ends of your system must already match this exact part. The listed details focus on the connection design, so any preference for a particular handle or actuator style should be checked against what your system expects.
Product Note
Groco FBV-Series 3" NPS Flange to 3" NPTF Bronze Seacock
If your marine plumbing or sanitation line calls for a 3-inch NPS flange on one end and a 3-inch NPTF thread on the other, this part is a direct fit at the listed price of USD 605.85. The limitation to weigh is the exact size and thread combination: unless both sides of your system match this specification, you will need adapters or a different seacock.
Bottom Line
Choose this seacock when your hull fitting and pipe side line up with the two ends of this part. The body and direct connection design make it a practical choice for that specific setup. Confirm your own connection standards first, and if they match the flanged and threaded ends described here, the Groco FBV-Series becomes a clear candidate for your marine plumbing project.
