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  • Apollo Ball Valves

    Apollo Ball Valves

    Apollo ball valves are made from cast bronze with a stainless steel handle and stem nut. Ball is...

    In Stock 

    Price: $133.86
  • Groco E-Valve Motorized Seacocks

    Groco E-Valve Motorized Seacocks

    Groco motorized seacocks provide easy push-button control from the engine room. Open and close upon...

    Price: $1697.85 to $1802.43
  • Conbraco Shut-Off Ball Valves

    Conbraco Shut-Off Ball Valves

    Conbraco Shut-Off Ball Valves are surface mounted, and have a 400 psi service rating. The valves...

    In Stock 

    Price: $30.56
  • Buck Algonquin Ball-Type Seacock

    Buck Algonquin Ball-Type Seacock

    Buck Algonquin Bronze full flow ball-type seacocks feature a low profile drain & grounding...

    In Stock 

    Price: $156.90 to $1030.34
  • Perko Ball Valve Bronze Seacocks

    Perko Ball Valve Bronze Seacocks

    Bronze Perko ball valve seacocks include thru-hull fitting, hose adapter, drain plug, four...

    In Stock 

    Price: $174.10 to $394.78
  • Conbraco Bronze Three-Way Diverter Valve

    Conbraco Bronze Three-Way Diverter Valve

    Bronze three way diverter valve with chrome plated ball, reinforced TFE seats, stuffing box ring,...

    In Stock 

    Price: $58.52
  • Conbraco Apollo Sea Flange Type Ball Valve

    Conbraco Apollo Sea Flange Type Ball Valve

    Apollo bronze ball valves replace older style sea cocks....

    In Stock 

    Price: $119.89 to $362.24
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Seacocks and Ball Valves

Seacocks are a crucial component of any well designed boat plumbing, engine cooling or water ballast system. Seacocks can be used to control the inflow or outflow of water and should be considered mandatory for all below-the-waterline connections. Seacocks may be constructed using a ball valve but NOT all ball valves are seacocks.

A true seacock features a flange that is bolted (or screwed) to a fairing block afixed to the hull. Top quality seacocks are manufactured by Groco, Buck Algonquin and Perko in marine grade bronze. Forespar manufactures seacocks in Marelon that is a formulation of glass-reinforced Dupont Zytel. All are ABYC compliant for marine use.

Most seacocks feature NPS (straight) threads on the flange (hull) side with NPT (tapered) pipe threads on the top side. Marelon seacocks feature NPS (straight) threads on both sides. Forespar offers Marelon hose fittings with NPS (straight) threads that are designed to work with their seacocks.

Ball Valves operate with a quarter turn similar to a seacock, but are not designed to be attached directly to a thru-hull fitting. Most ball valves feature NPT (tapered) threads on both ends and are compatible only with tapered pipe fittings.

Ball valves are suitable for liquid control applications within the boat hull. Ball valves are superior in function to old-fashioned gate valves. Ball valves offer rapid action and provide positive visual feedback whether open or closed.

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