Groco Seacock Backing Block

Flanged seacock installation is improved with the use of a backing block between the valve flange and the hull. � Each size fits multiple seacock sizes. � Press threaded inserts into the hull side of the backing block into the holes that match the seacock flange. � The 1/2" thickness is rigid enough for a secure installation but flexible enough to conform to minor hull curvature.

It will not swell or absorb moisture.

Fits Groco Flanged Adapters and both Groco and Apollo Seacocks.