C&D Valve # CD2290 - 1/4" Locking Refrigerant Safety Cap , Pack of (10) Pack of (10) Caps Locking Valve Cap Locks in place to prevent refrigerant loss Nickel plate & corrosion resistant Replaces / Supersedes: Baker BT2290 , CD-2290 , CD 2290 , Supco SF2290 SF 2290 and other Tamper Resistant Locking Caps