JB/Novent Universal StartPack - (4) Silver Universal Locking Caps with (1) Universal Key Images Shown for Representation Only 1/4" Thread Size Locking Cap Helps prevent loss from equipment, cylinders and recovery tanks Locks in place to prevent refrigerant loss Replaces / Supersedes: 86691 , NS-UNI 10PK , CD2290 , NOVENT , JB , Novent Refrigerant Locking Cap Rectorseal and others