*** use Option (1) to select Seacock Size ***Groco Backing Blocks for Flanged Seacocks Each size fits multiple seacock sizes Press threaded brass inserts into the hull side of the backing block into the holes that match the seacock flange Rigid 1/2" thickn
*** use Option (1) to select Seacock Size ***
Groco Backing Blocks for Flanged Seacocks
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