BB-4A

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 and environmentally friendly PVC foam specially formulated for marine applications.

Additional Information
Fits Seacock Sizes 4000
Diameter 9.5
Insert Threads 1/2"-13