FD3/FD1+ Waterproof Barometric Membrane

FD3/FD1+ Waterproof Barometric Membrane 

The waterproof barometric membrane is SwellPro's featured technology. It allows air to pass through the internal chamber of the aircraft to ensure the barometer's proper functioning yet keeps the water from getting in to ensure the Fisherman FD3 and FD1+ all waterproof design. 

(Qty of 1 membrane included.)