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Refrigerant theft is on the rise — protect yourself and your customers with SHIELD Refrigerant Locking Caps. Effective February 2009, International and Residential Code requires that all outdoor access ports on A/C refrigerant circuits be made tamper-resistant. If a locking cap is not applied after servicing an air conditioning unit, responsibility for theft or injury that occur afterwards can fall on the service technician and their company. Save homeowners money and avoid liability issues by installing SHIELD Refrigerant Locking Caps. The durable, all brass corrosion-resistant design is waterproof and includes color-coded caps, making it the best locking cap in the industry.