One of my compression testers doesn't use a Schrader valve, just a pushbutton valve to release the pressure. Maybe that's because it's rated up to 1000 psi for diesel engines. But the one for gas engines seems to have a standard Schrader valve core. It's only rated up to 300 psi. Again, it's just serves a release function. The check valve is between the Schrader valve and the connection for the spark plug. So I don't think it would need to be a low tension design. But if there's a Schrader-looking valve in the spark plug adapter, then maybe so. The one behind the spark plug adapter on my gasser tester doesn't appear to take any less pressure to open it when pushing on the stem.
If you have a valve core removal tool, just unscrew it and compare.
Last edited by klhansen; 02/15/202510:29 PM. Reason: added more info
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
