Groco Sea Cock Backing Block Size:2''2.5'' � With a single set

� With a single set of AA Lithium�batteries

Brass hose fittings are durable and rust resistant

The Xtratuf Unisex Riptide Sandal XRS200 falls squarely in the first camp

Wear and damage to your boat’s keel can break down its protective gelcoat finish

Groco Sea Cock Backing Block Size:2''2.5'' � With a single setBacking Block for 2" & 2 1 2" Seacocks Features: 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" thickness provides secure installation but is flexible enough to conform to minor hull curvature Will not swell or absorb moisture Made from an environmentally friendly PVC foam specially formulated for marine applications