# Air compressor on/off valve problem **URL:** \ **Category:** General Discussion\ **Created:** [April 25, 2019, 12:51am UTC](https://community.cartalk.com/t/air-compressor-on-off-valve-problem/139205 "2019-04-25T00:51:06Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [April 25, 2019, 12:51am UTC](https://community.cartalk.com/t/air-compressor-on-off-valve-problem/139205/1 "2019-04-25T00:51:06Z")
My “antique” air compressor has a defective manual on/off valve. It leaks and allows air to escape the tank when in the off position. I’m trying to come up w/a solution. The valve is an integral part of a manifold ass’y that screws into the tank, one port of which holds the pressure-controlled automatic on/off switch, another the over-pressure safety release valve, and the output port, which goes to the hose and two other gauges. Any ideas what that manifold with the on/off valve would be called? ---
**Author:** ![Rod-Knox](https://avatars.discourse-cdn.com/v4/letter/r/a183cd/32.png) [@Rod-Knox](https://community.cartalk.com/u/Rod-Knox)\ **Post date:** [April 25, 2019, 1:08am UTC](https://community.cartalk.com/t/air-compressor-on-off-valve-problem/139205/2 "2019-04-25T01:08:51Z")
Do you see it here @George_San_Jose1? [https://www.zoro.com/chicago-pneumatic-check-valve-1312100172/i/G0156208/](https://www.zoro.com/chicago-pneumatic-check-valve-1312100172/i/G0156208/) but it occurs to me that if that valve is leaking the leak would cause the compressor to turn. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [April 25, 2019, 1:14am UTC](https://community.cartalk.com/t/air-compressor-on-off-valve-problem/139205/3 "2019-04-25T01:14:21Z")
No. This manifold contains an integral slider which is the main on/off valve. It has a big red button on one side, and a black button on the other. You push it one way to turn it on, and the other way to turn it off. I can always make it from separate parts, sort of like this I suppose. > **[Ologymart 125PSI Air Compressor Pressure Valve Switch Control Manifold Regulator...](https://www.amazon.com/Compressor-Pressure-Control-Manifold-Regulator/dp/B07SHRH28Z)** > > Description: 125PSI Air Compressor Pressure Valve Switch Control Manifold Regulator Gauges- There is a red ON/OFF switch knob, convenient design for use.- Auto control, Auto load/unload. Pressure lower than 90PSI, turn on the compressor. Pressure... > [@Rod\_Knox](#): > > valve is leaking the leak would cause the compressor to turn. Yes, the leaking valve causes the compressor to turn on, when otherwise it would remain off. ---
**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\ **Post date:** [April 25, 2019, 1:35am UTC](https://community.cartalk.com/t/air-compressor-on-off-valve-problem/139205/4 "2019-04-25T01:35:55Z")
The valve that’s leaking is probably the one that relieves the pressure during starting. You’d need to get your specific manifold from the compressor manufacturer. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [April 25, 2019, 1:37am UTC](https://community.cartalk.com/t/air-compressor-on-off-valve-problem/139205/5 "2019-04-25T01:37:56Z")
It’s a manually operated valve, nothing to do with the compressor, similar in function to the small red valve in the Amazon photo above. Only it isn’t a twist on/off type, it is a push on, push off slider type. I’m starting to think the push on-push off slider type isn’t made any more. b/c it isn’t reliable.