The APS self venting cut-off valve is the same that is included with the APS PowerSmoke pump. It can be used on any brand smoke pump to improve the on/off performance and allow more flexibility with pump / tank location.

This unique valve has a lot of benefits. It sits between the pump, muffler and the return line to the tank (vent line). 

The use of this valve ensures that the pump does not accidentally let smoke oil through. This means the pump can also be mounted much lower than the smoke tank, without any issues of leaking. The vent line will purge air from the system, returning to the tank, to prime the fluid up to the valve quickly. 

An exact switching on and off of the smoke is now possible. Prolonged smoking or permanent smoking even when the pump is switched off is avoided by using this passive valve.

Also, the valve prevents the exhaust gases from being fed back into the pump and causing reliability issues.