Novent® locking caps seal standard HVAC/R Schraeder service valves on central AC units and minisplits to help prevent refrigerant leakage. Safe guard your AC system efficiency from loss or accidental mixing of refrigerant gases and from serious injury or death resulting from the inhalation of dangerous refrigerants. R22 and R410 color coded and embossed ID help prevent refrigerant gas mixing. Silver universal caps include adhesive labels for commonly used refrigerants. It's in the code. Effective February 2009, the International Mechanical Code and International Residential Code now require that all outdoor ports on refrigerant circuits be made tamper resistant.
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