Check Valve
Large diameter side fits into power unit. To test, remove vacuum line and check valve. Blow into large diameter hole. Valve should open. Blow into small diameter hole. Valve should close. Replace if defective.
Large diameter side fits into power unit. To test, remove vacuum line and check valve. Blow into large diameter hole. Valve should open. Blow into small diameter hole. Valve should close. Replace if defective.