Flanged seacock installation is improved with the use of a backing block between the valve flange and the hull.
- Each size fits multiple seacock sizes
- Press threaded inserts into the hull side of the backing block into the holes that match the seacock flange
- 1/2″ thickness is rigid enough for a secure installation but flexible enough to conform to minor hull curvature
- Will not swell or absorb moisture
Size: 4.29″ Dia.
Fits: 3/4″ & 1″ Seacocks
Bolt: 5/16″ – 18″
KMS Part# GRO BB1
DMP Part# 30-4988
Vendor # BB-1