3"-12 Inserts | McMaster-Carr

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2 Products

Screw-On Caps

Polyethylene

Thread onto male pipe and fittings for the most secure fit. These caps keep dust, paint, and coatings out of threads and pipe. They also protect from damage during manufacturing, shipping, and storage.

Polyethylene—These tough caps are hard and wear resistant to hold up against scrapes and gouges.

	Thread
	Size	Type	For OD	Inside Ht.	Flexibility	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Polyethylene







				For Straight-Thread Fittings

				3"-12	UN	3"	1 5/32"	Rigid	150	Red	10	1277K133	000000

Hollow Tapered Plugs

A hollow construction makes these plugs extra flexible, so they compress for easy installation and a snug fit. The tapered profile fits a range of hole diameters. If you flip the plug over, it can be used as a cap.

Polyethylene—Convenient and economical. Instead of cleaning and reusing, just toss and grab a new plug.

	For Thread Size	Ht.	Max. Temp., ° F	Color	Flange Dia.	Pkg. Qty.		Pkg.
Polyethylene



	2.849" to 2.98"	3"-12	3/4"	150	Red	3 1/4"	50	4491K22	000000