Conduit Hole Seals | McMaster-Carr

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85 Products

Watertight Knockout Plugs for Enclosures

Don't let water sneak into unused conduit knockouts. These plugs include a gasket that locks out moisture and dust to keep your electrical components dry and contaminant-free.

Clamp On—These plugs create a tighter hold than snap-in plugs but require access to both the inside and outside of the enclosure to install. Position the two metal plates of the plug on either side of the enclosure wall and tighten to sandwich the wall between them.

Oil-Resistant Powder-Coated Steel—The coating creates a barrier against water, mild detergents, and oil. However, if scratched, the underlying steel may rust.

Corrosion-Resistant 304 Stainless Steel—Won't corrode from frequent washdowns and can stand up to most cleaners, detergents, and oil.

Chemical-Resistant Fiberglass—Won’t break down when exposed to acids, solvents, salt water, and oil. These plugs are also a lightweight alternative to stainless steel.

	For Knockout
	Trade Size	Dia.	For Max. Panel Thk.	Head Dia.	For Enclosure Rating	Certification	Specs. Met		Each
Clamp On







				Oil-Resistant Powder-Coated Steel

				1/2	7/8"	0.31"	1 3/8"	NEMA 13, NEMA 4, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K53	000000


				3/4	1 1/16"	0.31"	1 9/16"	NEMA 13, NEMA 4, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K54	00000
				1	1 3/8"	0.31"	1 7/8"	NEMA 13, NEMA 4, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K55	00000
				1 1/4	1 11/16"	0.31"	2 3/16"	NEMA 13, NEMA 4, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K56	00000
				1 1/2	2"	0.31"	2 1/2"	NEMA 13, NEMA 4, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K57	00000
				2	2 1/2"	0.31"	3"	NEMA 13, NEMA 4, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K58	00000
				2 1/2	3"	0.31"	3 1/2"	NEMA 13, NEMA 4, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K33	00000
				3	3 5/8"	0.31"	4 1/8"	NEMA 13, NEMA 4, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K35	00000
				4	4 5/8"	0.31"	5 1/8"	NEMA 13, NEMA 4, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K37	00000




						Corrosion-Resistant 304 Stainless Steel

						1/2	7/8"	0.31"	1 3/8"	NEMA 13, NEMA 4X, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K63	00000


						3/4	1 1/16"	0.31"	1 9/16"	NEMA 13, NEMA 4X, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K64	00000
						1	1 3/8"	0.31"	1 7/8"	NEMA 13, NEMA 4X, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K65	00000
						1 1/4	1 11/16"	0.31"	2 3/16"	NEMA 13, NEMA 4X, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K66	00000
						1 1/2	2"	0.31"	2 1/2"	NEMA 13, NEMA 4X, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K67	00000
						2	2 1/2"	0.31"	3"	NEMA 13, NEMA 4X, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K68	00000
						2 1/2	3"	0.31"	3 1/2"	NEMA 13, NEMA 4X, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K34	000000
						3	3 5/8"	0.31"	4 1/8"	NEMA 13, NEMA 4X, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K36	000000
						4	4 5/8"	0.31"	5 1/8"	NEMA 13, NEMA 4X, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K38	000000




								Chemical-Resistant Fiberglass

								—	1/2" to 13/16"	1/4"	1"	NEMA 12, NEMA 6P, IP66, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	9357K11	0000


								1/2	7/8"	1/4"	1 3/16"	NEMA 6P, IP66, IP68	—	—	9357K15	0000
								1/2, 3/4	7/8" to 1 9/32"	1/4"	1 1/2"	NEMA 12, NEMA 6P, IP66, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	9357K12	00000
								1, 1 1/4	1 3/8" to 1 3/4"	1/4"	2"	NEMA 12, NEMA 6P, IP66, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	9357K13	00000
								1 1/2, 2	2" to 2 9/16"	1/4"	2 3/4"	NEMA 12, NEMA 6P, IP66, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	9357K14	00000
								3	3 5/8"	1/4"	4"	NEMA 12, NEMA 6P, IP66, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	9357K16	00000
								4	4 5/8"	1/4"	5"	NEMA 12, NEMA 6P, IP66, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	9357K17	00000

Knockout Plugs for Enclosures

Guard your electrical components from debris and pesky critters. Use these plugs to block unused conduit knockouts in enclosures, outlet boxes, junction boxes, and electrical panels.

Snap In—Press these plugs into knockouts from the outside until they snap into place—there’s no need to reach inside. All have built-in clips for a secure hold. To remove, pry them out with a flathead screwdriver.

	For Knockout
	Trade Size	Dia.	For Max. Panel Thk.	Head Dia.	Pkg. Qty.		Pkg.
Snap In







				Steel

				1/2	7/8"	1/8"	1 1/16"	25	8087K12	000000


				3/4	1 1/8"	1/8"	1 1/4"	25	8087K14	00000
				1	1 3/8"	1/8"	1 1/2"	25	8087K16	00000
				1 1/4	1 3/4"	1/8"	1 13/16"	25	8087K18	00000
				1 1/2	2"	1/8"	2 3/16"	25	8087K25	00000
				2	2 1/2"	1/8"	2 11/16"	10	8087K27	00000


				Clamp On







								Zinc-Plated Steel

								1/2	7/8"	1/16"	1 1/8"	1	71995K81	0000


								3/4	1 1/8"	1/16"	1 3/8"	1	71995K82	0000
								1	1 3/8"	1/16"	1 5/8"	1	71995K83	0000
								1 1/4	1 3/4"	1/16"	2 1/16"	1	71995K89	0000
								1 1/2	2"	1/16"	2 7/16"	1	71995K84	0000
								2	2 7/16"	1/16"	2 15/16"	1	71995K85	0000
								2 1/2	2 15/16"	1/16"	3 3/4"	1	71995K86	0000
								3	3 9/16"	1/16"	4 1/2"	1	71995K87	0000
								3 1/2	3 3/4"	1/16"	5"	1	71995K91	0000
								4	4 5/8"	1/16"	5 1/2"	1	71995K88	00000

Sanitary Threaded Plugs for Enclosures

Super smooth with round edges that prevent bacteria buildup, these plugs are FDA compliant for food processing areas. Screw them in unused threaded holes for a more secure hold than clamp-on and snap-in plugs. These plugs include a seal that locks out moisture and dust to keep your electrical components dry and contaminant-free. Twist them in place from the outside of the enclosure and then tighten with a hex key from the inside.

Highly Corrosion-Resistant 316L Stainless Steel—Superior to 304 stainless steel, these plugs won’t pit or weaken when exposed to harsh chemicals, including bleach and salt water.

	Head Dia., mm	For Enclosure Rating		Each
Highly Corrosion-Resistant 316L Stainless Steel



	M10 × 1.5 mm	19.7	IP66	7805N111	00000

Watertight Push-Button Plugs for Enclosures

Seal unused push-button switch holes so water won't sneak in. These plugs include a gasket that locks out moisture and dust to keep your electrical components dry and contaminant-free.

Oil-Resistant Powder-Coated Steel—The coating creates a barrier against water, mild detergents, and oil. However, if scratched, the underlying steel may rust.

Corrosion-Resistant 304 Stainless Steel—Won't corrode from frequent washdowns and can stand up to most cleaners, detergents, and oil.

	Head Dia.	For Enclosure Rating	Certification	Specs. Met		Each
Clamp On







	Oil-Resistant Powder-Coated Steel

	22	7/8"	0.31"	1 1/4"	NEMA 13, NEMA 4, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K51	000000


	30	1 1/4"	0.31"	1 3/4"	NEMA 13, NEMA 4, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K52	00000




			Corrosion-Resistant 304 Stainless Steel

			22	7/8"	0.31"	1 1/4"	NEMA 13, NEMA 4X, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K61	00000


			30	1 1/4"	0.31"	1 3/4"	NEMA 13, NEMA 4X, IP66	CSA Certified, UL Recognized Component	UL 508A	7845K62	00000

Watertight Threaded Plugs for Enclosures

Screw into unused threaded holes to block out water with a more secure hold than clamp-on and snap-in plugs. These plugs include a gasket that locks out moisture and dust to keep your electrical components dry and contaminant-free. Install them from the outside.

	Thread Size	Head Dia.	For Enclosure Rating	Certification	Specs. Met		Each
Nylon



	1/2	—	1"	NEMA 4X, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	7280K161	00000


	3/4	—	1 5/16"	NEMA 4X, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	7280K17	0000
	1	—	1 3/4"	NEMA 4X, IP68	—	—	7280K18	0000
	1 1/4	—	2 1/16"	NEMA 4X, IP68	—	—	7280K19	0000
	—	M12 × 1.5 mm	5/8"	NEMA 4X, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	7381K28	0000
	—	M16 × 1.5 mm	13/16"	NEMA 4X, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	7381K29	0000
	—	M20 × 1.5 mm	1"	NEMA 4X, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	7381K31	0000
	—	M25 × 1.5 mm	1 5/16"	NEMA 4X, IP68	—	—	7381K35	0000
	—	PG-7	5/8"	NEMA 4X, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	7381K241	0000
	—	PG-9	13/16"	NEMA 4X, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	7381K25	0000
	—	PG-21	1 5/16"	NEMA 4X, IP68	C-UL Recognized Component, UL Recognized Component	UL 508A	7381K26	0000


	—	PG-29	1 3/4"	NEMA 4X, IP68	—	—	7381K27	0000

Expansion Plugs for Conduit

Seal conduit openings to keep water, dirt, and animals from damaging your wiring. When you twist the nut on top of these plugs, a rubber seal expands to close off the end of your conduit. Tie a rope or pull line to the loop at either end of these plugs to hold them in place during installation.

	For Conduit			Material
	Trade Size	ID	Overall Ht.	Seal	Loop	Features		Each
Loop Nut—Plastic Plate



		3/4	0.77" to 1.02"	3 1/4"	Synthetic Rubber	Plastic	Internal Eyebolt	6564N11	00000


		1	0.99" to 1.39"	3 3/4"	Synthetic Rubber	Plastic	Internal Eyebolt	6564N12	0000
		1 1/4	1.16" to 1.51"	3 13/16"	Synthetic Rubber	Plastic	Internal Eyebolt	6564N13	0000
		1 1/2	1.46" to 1.83"	4"	Synthetic Rubber	Plastic	Internal Eyebolt	6564N14	0000
		2	1.83" to 2.39"	4"	Synthetic Rubber	Plastic	Internal Eyebolt	6564N15	0000
		2 1/2	2.4" to 2.99"	7 1/2"	Synthetic Rubber	Plastic	Internal Eyebolt	6564N16	00000
		3	2.92" to 3.45"	7 5/8"	Synthetic Rubber	Plastic	Internal Eyebolt	6564N17	00000
		3 1/2	3.41" to 3.9"	8 3/16"	Synthetic Rubber	Plastic	Internal Eyebolt	6564N18	00000
		4	3.94" to 4.33"	7 1/2"	Synthetic Rubber	Plastic	Internal Eyebolt	6564N19	00000
		5	4.85" to 5.25"	7 5/8"	Synthetic Rubber	Plastic	Internal Eyebolt	6564N21	00000
		6	5.92" to 6.37"	10 5/8"	Synthetic Rubber	Plastic	Internal Eyebolt	6564N22	00000

Threaded Plugs for Enclosures

Screw into unused threaded holes in enclosures, outlet boxes, junction boxes, and electrical panels for a more secure hold than clamp-on and snap-in plugs. Use these plugs to protect your electrical components in dusty or hazardous locations. Install them from the outside.

	Thread Size	Head Dia.	For Enclosure Rating	Hazardous Location Rating	Certification	Specs. Met		Each
Aluminum



	1/2	—	3/4"	—	NEC Class I Divisions 1, 2 Groups A, B, C, D; NEC Class II Divisions 1, 2 Groups E, F, G; NEC Class III Divisions 1, 2	CSA Certified, UL Listed	UL 886, UL 1203	7280K11	00000


	3/4	—	1"	—	NEC Class I Divisions 1, 2 Groups A, B, C, D; NEC Class II Divisions 1, 2 Groups E, F, G; NEC Class III Divisions 1, 2	CSA Certified, UL Listed	UL 886, UL 1203	7280K12	0000
	1	—	1 1/4"	—	NEC Class I Divisions 1, 2 Groups A, B, C, D; NEC Class II Divisions 1, 2 Groups E, F, G; NEC Class III Divisions 1, 2	CSA Certified, UL Listed	UL 886, UL 1203	7280K13	0000
	1 1/4	—	1 1/2"	—	NEC Class I Divisions 1, 2 Groups A, B, C, D; NEC Class II Divisions 1, 2 Groups E, F, G; NEC Class III Divisions 1, 2	CSA Certified, UL Listed	UL 886, UL 1203	7280K14	0000
	1 1/2	—	1 3/4"	—	NEC Class I Divisions 1, 2 Groups A, B, C, D; NEC Class II Divisions 1, 2 Groups E, F, G; NEC Class III Divisions 1, 2	CSA Certified, UL Listed	UL 886, UL 1203	7280K15	00000
	2	—	2 1/4"	—	NEC Class I Divisions 1, 2 Groups A, B, C, D; NEC Class II Divisions 1, 2 Groups E, F, G; NEC Class III Divisions 1, 2	CSA Certified, UL Listed	UL 886, UL 1203	7280K16	00000


	Nickel-Plated Brass



			—	M12 × 1.5 mm	9/16"	IP54	—	C-UL Recognized Component, CE Marked, UL Recognized Component	—	7381K21	0000


			—	M16 × 1.5 mm	11/16"	IP54	—	C-UL Recognized Component, CE Marked, UL Recognized Component	—	7381K22	0000
			—	M20 × 1.5 mm	7/8"	IP54	—	C-UL Recognized Component, CE Marked, UL Recognized Component	—	7381K23	0000
			—	M25 × 1.5 mm	1 1/8"	IP54	—	C-UL Recognized Component, CE Marked, UL Recognized Component	—	7381K34	0000
			—	PG-7	9/16"	IP54	—	CE Marked	—	7381K11	0000
			—	PG-9	11/16"	IP54	—	CE Marked	—	7381K12	0000
			—	PG-11	13/16"	IP54	—	CE Marked	—	7381K13	0000
			—	PG-16	15/16"	IP54	—	CE Marked	—	7381K14	0000
			—	PG-21	1 3/16"	IP54	—	CE Marked	—	7381K15	0000
			—	PG-29	1 9/16"	IP54	—	CE Marked	—	7381K16	00000