Vented loop Black 19 mm GRP

Vented Loop 19mm, Black
90318

Designed and made in New Zealand, Tru-Design Vented Loops are the superior composite siphon break solutions for marine applications. 
Vented Loops prevent water siphoning from underwater skin fittings back into a vessel and thereby guard against accidental flooding and sinking. 

Vented loops are used predominantly in toilet to overboard applications, toilet inlet applications and holding tank to overboard applications. 
They can also be used in genset or small engine inlet cooling water systems.
The simple one way breather valve at the top of the vented loop allows air to enter the line when not in use, thereby preventing siphoning - and yet seals when water or waste passes through the
loop. The duckbill one way valve is designed to seal even when particles are present in the fluid.
Vented Loops are moulded from a glass reinforced nylon composite. High strength, high-modulus glass fibres impregnated into the nylon provides dramatic strength, stiffness, toughness, and
dimensional stability to the loops.

When a Vented Loop is used on the suction side of a pump, the water flow can be reduced by 25% due to air admission. 
It is recommended that this type of installation be only used for electric pump type toilets as the higher flow from the electric pump is less affected by this reduction.
On the outlet of a pump, there is no reduction in flow as the valve closes fully.