Caplugs RC375-1500 RC-SH Series, EPDM Rubber Masking Cap, To Mask Plain and Threaded Studs, Hole Protection, Chemical Resistance, Reuseable, Cap ID 0.375", Length 1.500", Black, Pack of 500 (SH-62392)
EPDM Rubber caps are designed to mask plain and threaded studs, tube ends and even slotted holes; they will mask off the stud and allow finishing up to it.