Novent 1/4" Start Pack with (4) R22 Green Caps and Universal Key Images Shown for Representation Only 1/4" Thread Size Locking Cap with Diversitech RSC Universal Key , Fits ALL Novent Caps & C&D Caps Helps prevent loss from equipment, cylinders and recovery tanks Locks in place to prevent refrigerant loss Replaces / Supersedes: 86663 , NG-R22 50PK , NG-R2250PK , CD2290 , NOVENT , JB , 86698 , NV MULTIKIEY , Airtec , Novent NV-MULTI , NVMULTIKEY , NV-Multi Key , Rectorseal and other Refrigerant Security / Safety Cap and others