For Pipe Size 3 Caps | McMaster-Carr

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	For Pipe Size For Pipe Size	Show

	For Pipe Size For Pipe Size	Hide

	System of Measurement System of Measurement

Inch

	For OD For OD

	For Shape For Shape

	Round

	Material Material

	Cap Type Cap Type


Push On	Snap On

Adhesive Back

	Profile Profile


Straight	Tapered

	Inside Height Inside Height

3/4"

1 1/8"

1 3/8"

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	For ID For ID

2.975"-3.103"

3.27"-3.562"

3.325"-3.457"

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Maximum Temperature Maximum Temperature

100° to 249.9° F

250° to 499.9° F

Not Rated

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Color Color

	Black
	Red
	Blue

	For Connection Type For Connection Type

Unthreaded Pipe

Tapered-Thread Pipe

Flange

	Expansion Plug Type Expansion Plug Type


Wing Nut	Hex Nut

Snap	Inflatable

T-Handle	Square Head

	Sealing Location Sealing Location

	End of Pipe		Inside Pipe

	For Minimum Pipe ID For Minimum Pipe ID

2" to 4.99"

	Type Type

	Cap		Plug

	Plate Material Plate Material

Stainless Steel

Steel

Plastic

	Plug Type Plug Type

	Push In

	Shape Shape

	Cap/Plug

	Seal Material Seal Material

Rubber

Plastic

	For Maximum Pipe ID For Maximum Pipe ID

1" to 4.99"

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36 Products

Metal Round Caps

More durable than plastic caps, these provide the most protection from abrasion and impact.

Steel caps are stronger than aluminum.

Aluminum caps have good corrosion resistance, are lightweight, and are nonmagnetic.

Stainless steel caps have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.

For technical drawings and 3-D models, click on a part number.

			Steel		Aluminum		18-8 Stainless Steel
For OD	For Pipe Size	Inside Ht.		Each		Each		Each
Caps for Unthreaded Pipe
3 1/2"	3	1 3/8"	0000000	00000	0000000	000000	00000000	000000

Tapered Caps

These flexible plastic caps are tapered to fit a variety of unthreaded and threaded objects.

For technical drawings and 3-D models, click on a part number.

Caps for Unthreaded Pipe

Flexible Polyethylene Plastic
For OD	For Pipe Size	Inside Ht.	Max. Temp., °F	Color	Pkg. Qty.		Pkg.
3.41"-3.54"	3	3/4"	150°	Red	10	00000000	00000

Caps for NPT Tapered-Thread Pipe

Flexible Polyethylene Plastic
For OD	For Pipe Size	Inside Ht.	Max. Temp., °F	Color	Pkg. Qty.		Pkg.
3.2"-3.492"	3	1 1/8"	150°	Red	25	0000000	000000

Tear-Tab Caps

Push these caps onto pipe and fittings, then tear their tab to break the seal for easy removal.

For technical drawings and 3-D models, click on a part number.

Rigid Polyethylene Plastic
For OD	For Pipe Size	Inside Ht.	Max. Temp., °F	Color	Pkg. Qty.		Pkg.
For NPT Tapered-Thread Pipe and Unthreaded Pipe
3.411"	3	1 3/8"	150°	Blue	25	0000000	000000

Adhesive-Back Flange Caps

Stick these caps on the raised surfaces of flanges or other flat surfaces for extra protection during transport and storage.

For technical drawings and 3-D models, click on a part number.

Rigid Plastic
For Pipe Size	For OD	Adhesive Type	Max. Temp., °F	Color	Pkg. Qty.		Pkg.
3	5"	Rubber	160°	Black	4	0000000	000000

Flange Caps

Cap Installed on Flange

Cap

Snap these caps into flange bolt holes to safeguard pipe flanges during shipping, storing, and finishing applications. They all have a thick center pad to protect the flange opening and pipe threads from damage.

For technical drawings and 3-D models, click on a part number.

Flexible Polyethylene Plastic
For Pipe Size	For Pressure Class	For Bolt Circle Dia.	Max. Temp., °F	Color	Pkg. Qty.		Pkg.
3	150	6"	175°	Red	1	0000000	00000

Hollow Tapered Plugs

The hollow construction allows these plugs to compress for a snug fit in threaded and unthreaded holes of varying diameters. Use the flange to remove them with ease.

For technical drawings and 3-D models, click on a part number.

Polyethylene Plastic
For Pipe Size	For ID	Ht.	Flange Dia.	Max. Temp., °F	Hardness	Color	Pkg. Qty.		Pkg.
For Unthreaded Pipe
3	2.975"-3.103"	3/4"	3 11/32"	150°	Durometer 45D	Red	25	00000000	000000
3	3.27"-3.562"	1.13"	3 11/16"	150°	Durometer 45D	Red	10	0000000	0000
For NPT Tapered-Thread Pipe
3	3.325"-3.457"	3/4"	3 5/8"	150°	Durometer 45D	Red	50	0000000	00000

Low-Pressure Clamp-On Connectors for Drain, Waste, and Vent

Tighten the bands on these connectors to form a strong seal on pipe or fittings.

For technical drawings and 3-D models, click on a part number.

Caps

For Use With: Air, Water
Temperature Range: -40° to 120° F
Specifications Met: ASTM D5926
For Pipe Material: Stainless Steel, Iron, Steel, Aluminum, PVC Plastic, CPVC Plastic

Pipe
For Pipe OD	For Pipe Size	Max. Pressure	Material	Clamp Material	Flexibility		Each
3 1/2"	3	4 psi @ 72° F	PVC Plastic	300 Series Stainless Steel	Flexible	0000000	00000

Wing Nut Expansion Plugs

Twist the wing nut on these plugs to expand the seal and close off pipe openings. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

A wide top flange on Style B stops these plugs from falling into pipes.

For Pipe		Max. Back Pressure
Size	ID	Air, psi	Water, ft. of head	O'all Ht.	Temp. Range, °F	Seal Material	Lock Type	For Max. Shackle Dia.		Each
Style A
Zinc-Plated Steel Plate
3	2.86"-3.25"	2	5	2 11/16"	-20° to 125°	Natural Rubber	__	__	0000000	00000
Stainless Steel Plate
3	2.86"-3.25"	2	5	2 11/16"	0° to 175°	Buna-N Rubber	__	__	0000000	00000
Style B
Plastic Plate
3	2.80"-3.10"	17	40	2 1/2"	-20° to 125°	Natural Rubber	__	__	0000000	0000
Style D
Plastic Plate
3	2.80"-3.10"	6	15	2 5/8"	-20° to 125°	Buna-N Rubber	Padlockable	5/16"	00000000	00000

Quick-Snap Expansion Plugs

Turn the cam handle to expand the seal, then snap the handle down to hold it in place and close off pipe openings. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

For technical drawings and 3-D models, click on a part number.

For Pipe		Max. Back Pressure					Brass Handle		Stainless Steel Handle
Size	ID	Air, psi	Water, ft. of head	O'all Ht.	Temp. Range, °F	Seal Material		Each		Each
Zinc-Plated Steel Plate
3	2.94"-3.10"	5	12	2 1/4"	-40° to 250°	Neoprene Rubber	0000000	000000	000000	00
Stainless Steel Plate
3	2.94"-3.10"	5	12	2 1/4"	-40° to 250°	Neoprene Rubber	000000	00	0000000	000000

Hex-Nut Expansion Plugs

Tighten the nut on these plugs to expand the seal and close off pipe openings. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

Style D have an eyebolt that allows you to tether or hang the plug for convenient storage.

For Pipe		Max. Back Pressure
Size	ID	Air, psi	Water, ft. of head	O'all Ht.	Temp. Range, °F	Seal Material		Each
Style B
Stainless Steel Plate
3	2.92"-3.20"	5	12	3 1/16"	-40° to 250°	Neoprene Rubber	0000000	000000
Style C
Zinc-Plated Steel Plate
3	2.73"-3.07"	50	115	3 1/2"	-20° to 225°	Neoprene Rubber	0000000	000000
Style D
Zinc-Plated Steel Plate
3	2.74"-3.25"	15	34	7 1/2"	-20° to 225°	Neoprene Rubber	0000000	000000

T-Handle Expansion Plugs

Twist the easy-grip t-handle on these plugs to expand the seal and close off pipe openings. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

For Pipe		Max. Back Pressure					Brass Handle		Stainless Steel Handle
Size	ID	Air, psi	Water, ft. of head	O'all Ht.	Temp. Range, °F	Seal Material		Each		Each
Zinc-Plated Steel Plate
3	2.92"-3.10"	5	12	3 5/8"	-40° to 250°	Neoprene Rubber	0000000	000000	000000	00
Stainless Steel Plate
3	2.92"-3.10"	5	12	3 5/8"	-40° to 250°	Neoprene Rubber	000000	00	0000000	000000

Square-Head Expansion Plugs

Turn the square head of the plug into the sealing ring to close off pipe openings. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

For Pipe		Max. Back Pressure
Size	ID	Air, psi	Water, ft. of head	O'all Ht.	Temp. Range, °F	Seal Material		Each
Plastic Head
3	3.07"-3.16"	21	50	2"	35° to 210°	PVC	00000000	00000

Expansion Plugs with Bypass

Use the bypass tube on these plugs to add air, water, and other fluid to your pipeline or to relieve pressure while testing. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

For Pipe		Max. Back Pressure				Material		Bypass
Size	ID	Air, psi	Water, ft. of head	O'all Ht.	Temp. Range, °F	Seal	Bypass Cap	Pipe Size	Thread Type	Gender		Each
Style A
Aluminum Stem
3	2.77"-3.25"	125	288	8 1/4"	-20° to 170°	Natural Rubber	Metal	3/8	NPS	Male	0000000	000000
Style C
Iron Stem
3	2.75"-3.00"	Not Rated	34	10 1/2"	30° to 150°	Natural Rubber	Metal	1/2	NPT	Male	0000000	00000
Style D
Plastic Stem
3	2.87"-3.31"	15	34	4 1/2"	-40° to 180°	Natural Rubber	Plastic	1/2	NPT	Male	0000000	00000

Air-Inflatable Plugs

Conform to wide and out-of-round pipes with these inflatable plugs. Also known as pneumatic plugs, they're designed for temporary seals since they can lose pressure over time. Inflate with a hand pump (sold separately); an air compressor may overinflate the plug and cause damage. Tether the plugs using either the eyebolt or chain/ring so they don't get lost or stuck in your pipes. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

With Chain

For Pipe		Deflated		Max. Back Pressure				Material
Size	ID	Dia.	Ht.	Air, psi	Water, ft. of head	Required Inflation Pressure, psi	Temp. Range, °F	Seal	Chain/Ring		Each
3	2.77"-3.25"	2 5/8"	5 1/4"	13	30	35	-20° to 125°	Natural Rubber	Zinc-Plated Steel	000000	000000

Air-Inflatable Plugs with Bypass

Conform to wide and out-of-round pipes with these inflatable plugs. Also known as pneumatic plugs, they're designed for temporary seals since they can lose pressure over time. Use the bypass tube on these plugs to add air, water, and other fluid to your pipeline or to relieve pressure while testing. Inflate with a hand pump (sold separately); an air compressor may overinflate the plug and cause damage. Tether the plugs using either the eyebolt or chain/ring so they don't get lost or stuck in your pipes. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

With Chain

For Pipe		Deflated		Max. Back Pressure			Bypass				Material
Size	ID	Dia.	Ht.	Air, psi	Water, ft. of head	Required Inflation Pressure, psi	Pipe Size	Thread Type	Gender	Temp. Range, °F	Seal	Chain/Ring		Each
3	2.62"-3.25"	2 1/2"	8"	22	50	40	1/2	NPT	Female	-20° to 125°	Natural Rubber	Zinc-Plated Steel	0000000	0000000

Deep-Reach Hex Nut Expansion Plugs with Bypass

Plug your pipe from the inside. Insert these expansion plugs deep into your pipe, and then tighten the nut on the stem. Use the bypass tube to add air, water, and fluid or relieve back pressure. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

For technical drawings and 3-D models, click on a part number.

For Pipe		Max. Back Pressure					Bypass
Size	ID	Air, psi	Water, ft. of head	O'all Ht.	Temp. Range, °F	Seal Material	Pipe Size	Thread Type	Gender		Each
Zinc-Plated Steel Stem
3	3.03"-3.13"	50	115	4 3/8"	-20° to 225°	Neoprene Rubber	1/4	NPT	Male	0000000	0000000

Deep-Reach Wing Nut Expansion Plugs

Stainless Steel
Plate With
Brass Stem

Insert these plugs deep within your pipe to seal it off from the inside. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

For Pipe		Max. Back Pressure
Size	ID	Air, psi	Water, ft. of head	O'all Ht.	Temp. Range, °F	Seal Material		Each
Stainless Steel Plate with Brass Stem
3	2.95"-3.15"	17	40	11"	0° to 125°	Natural Rubber	0000000	000000

Drain Pipe Plugs

Seal unthreaded pipe ends with these plugs. They come with a band that clamps over the outside wall of your pipe and tightens with a screwdriver.

For Pipe		Max. Back Pressure
Size	OD	Water, ft. of head	Air	Temp. Range	Material	Clamp Material		Each
3	3.34"-3.50"	10	Not Rated	Not Rated	Neoprene Rubber	Stainless Steel	0000000	00000

Cleanout Plugs

Recessed

Raised

Close off your drain cleanout pipe with these threaded plugs. Note: If you do not know your pipe size, measure the OD of your existing cleanout plug or the ID of your cleanout fitting and match to the value listed.

			Brass				Black ABS Plastic
			Recessed		Raised		Recessed
For Pipe Size	Thread Type	Cleanout Plug OD/Fitting ID		Each		Each		Each
3	NPT	3 15/32"	0000000	000000	0000000	000000	0000000	00000

Driver for Recessed Plugs

000000

Each

000000