• When installed, the outer casing will rotates around the thread insert, not allowing cap to be removed, an integral torque limiter prevents over tightening Novent locking cap have an inner thread insert made of precision machined solid brass Outer shells is made of a protective corrosion-resistant anodized aluminum shroud Integral neoprene O-ring resists oils and sealants Embossed ID labelling prevents refrigerants gas mixing Grasp cap, insert keys and turn clockwise until snug Place female thread of the Novent cap onto male thread of the Schrader valves and tighten securely be hand using the Novent keys Grasp cap, rotates keys counter clockwise and remove keys Reverse for removal of cap

Novent Key Style locking caps were specifically designed to protect standard Schrader service valves on A/C units to help prevent leakage or misuse of refrigerant on residential and commercial equipment.