Novent 1/4" Start Pack with (2) R410A"Pink" Caps and Universal Key Images Shown for Representation Only 1/4" Thread Size Locking Cap with RSC TOOL Universal Key , Fits ALL Novent Caps Helps prevent loss from equipment, cylinders and recovery tanks Locks in place to prevent refrigerant loss Replaces / Supersedes: Novent Locking Cap , Rectorseal , 86681 , NP-R410 10PK , CD2290 , NOVENT , JB and others