Groco Backing Block Fits Seacock 1250 & 1500 McLube Direct Bulb Replacements for Most

Direct Bulb Replacements for Most Nav Lights

Epoxy/graphite is commonly used as a bearing surface

Switch Included: Double Pole Double Throw (DPDT) reversing switch

Plexiglass

Groco Backing Block Fits Seacock 1250 & 1500 McLube Direct Bulb Replacements for MostBB SERIES BACKING BLOCKS 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. Rigid 1 2" thickness provides secure installation but is flexible enough to conform to minor hull curvature. Will not swell or absorb moisture.