GROCO Backing Block f/2" 2-1/2" Seacocks [BB-3] Cartography Reduced installation labor due to

Reduced installation labor due to shorter battery cable runs

VelocityTrack Doppler technology for collision avoidance

The “SSI” system lets you reconfigure your sub at the flip of a switch – something you can't do with ordinary marine subwoofers – so it always fit in your system as it evolves

34" Threaded Stud Adapter

GROCO Backing Block f/2" 2-1/2" Seacocks [BB-3] Cartography Reduced installation labor due toBacking Block for 2" & 2 1 2" Seacocks 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 Specifications: