These speakers are UV-resistant so you can worry less about the sun damaging your equipment and more about your great sound system

RCA + speaker wire inputs

Molded plastic

Heavy Duty Products

actuator and snap-in mounting

Groco - Backing Block, Part No. BB-2 MMarine Online These speakers are UV-resistant soEach 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. Fits Seacock Sizes Dia. Insert Threads 1250 & 1500 5. 38 5 16" 18