Groco BB-1 Backing Block f/3/4" & 1" Seacocks

Backing Block for 3/4" & 1" 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