Diaphragm valves with swivel seals for more positive seal and less wear. Durable rubber gauge cover for added support and protection. Comes with back hook for hanging the manifold gauge in place. Designed to meet 1/4 Standard SAE requirement for refrigerant permutation. Attention:Adapter is required for R410a.This item is in the category "Business & Industrial\HVAC & Refrigeration\HVAC & Refrigeration Tools\HVAC & Refrigeration: Gauges & Probes". The seller is "oneflatworld" and is located in this country: US.