Groco Backing Block Fits Seacock 1250 & 1500

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BB SERIES - BACKING BLOCKS 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. Pr ess threaded inserts into the hull side of the backing block into the holes that match the seacock flange. Rigid 1/2" thickness provides secure installation but is flexible enough to conform to minor hull curvature. Will not swell or absorb moisture. Show more