It is ISO 50N approved and ensures both safety and a good fit with adjustable straps and a zipper

It measures 75 x 75 mm and is designed to resist corrosion

It stands stably on the ground and relieves wind pressure against the boat

Package dimensions: Dimensions: 10 cm × 22

so they should be placed in the stern/lazarette/engine room so the sound is not heard in the cabin (apart from a little air noise)

Whale, kontraventil 3/4'' kompl. 19 mm 000-16279-001 It is ISO 50N approvedThe Whale non return valve is designed to be installed with your electric bilge pump. It prevents water from flowing back into the hose when the pump stops. Brand: Whale Weight: 0. 12 kg Made in: United Kingdom Package dimensions: Dimensions: 13 cm 8 cm 3 cm Gross weight: 0. 12 kg Install a non return valve with your electric bilge pump so you avoid water flowing back into the hose when the pump stops.