This listing is for 1 non locking Air Control Valve for many semi hydraulic inground lifts that have 1 air control valve that controls up and down movement of the in ground plunger

These valves can be found on Western, Weaver, Rotary Lift  and other inground low pressure lifts operated with 1 valve

This valve is 1/2" NTP thread on all 3 ports 1 in, 1 out, and 1 to hoist

We also sell mufflers for this valve please take a look at are other listings or call for info.