Shakespeare Style 4008-4 Extension Mast VHF Antenna Swing Flap valve prevents following seas

Flap valve prevents following seas from entering exhaust outlet when stopping or moving slowly

Flow Rate: 800 gph

Problem solved

Allows ladder to swing up when motoring

Shakespeare Style 4008-4 Extension Mast VHF Antenna Swing Flap valve prevents following seasShakespeare 4008 4 fiberglass extension 4' with chrome plated brass ferrules, upper male and lower female 1" 14 threads. Shakespeare 4008 4 extension mast heavy duty is manufactured of the same Shakespeare fiberglass reinforced composites as our fine antennas. Use them to extend the reach of your marine VHF antenna by increasing its height above the water. 4' EXTENSION 1 1 2 CHR FIT 4008 4 EXTENSION MAST 4' HEAVY DUTY Lightweight, 1" diameter