Groco BB-1 Backing Block for Flanged Seacock Installation

The Groco BB-1 backing block is designed to improve flanged seacock installations by providing a stable, moisture-resistant interface between the valve flange and the hull. This marine-grade backing block ensures a secure, long-lasting installation that conforms to minor hull irregularities.

Key Features:

• Universal fit design - each size accommodates multiple seacock sizes
• 1/2" thickness provides optimal rigidity for secure mounting while remaining flexible enough to conform to minor hull curvature
• Threaded inserts press into the hull side of the backing block, aligning with seacock flange mounting holes
• Non-absorbent material will not swell or retain moisture in marine environments
• Constructed from environmentally friendly PVC foam specially formulated for marine applications

This backing block distributes load evenly across the hull surface and provides a professional foundation for through-hull seacock installations. The marine-grade PVC foam construction ensures durability and resistance to the harsh marine environment.