Vacuum Check Valve
Apply 16 in. Hg vacuum to check side of valve and trap. If vacuum remains above 15 in. Hg for 10 seconds, valve operation is normal. If not, replace valve.
Apply 16 in. Hg vacuum to check side of valve and trap. If vacuum remains above 15 in. Hg for 10 seconds, valve operation is normal. If not, replace valve.