BB-1

Backing Block

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.