Even though Proseal can form a seal on the Schrader valve, when you hook up to it the seal will release and allow you to use the Schrader if necessary. If there is still Proseal in the system it will reseal the Schrader.
Envirosafe Arctic Air for R12, Refrigerant support, 2 cans Brass Gauge
Envirosafe Arctic Air for R12, Auto AC Refrigerant Support, 1 can
Envirosafe Arctic Air for R-1234yf with Proseal, Leak Detector, R1234 and Gauge
Envirosafe Arctic Air for R12, Auto AC Support, 1 can and hose
Envirosafe Arctic air for R12, Auto AC support, 3 cans & brass charging gauge
Envirosafe Arctic Air for R1234yf, 6 Cans and Gauge, r1234, r1234yf
