3 To 4 Expansion Plugs | McMaster-Carr

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Expansion Plug Type

Deflated Diameter

Material

Sealing Location

Maximum Air Back Pressure

10 psi to 24 psi

Body Texture

Ribbed

Required Inflation Pressure

40 psi

50 psi

60 psi

With Bypass

Performance

Air Inflatable

Water Inflatable

Maximum Water Back Pressure

Less than 50 ft. of head

Deflated Height

5 3/16"

23 1/2"

Maximum Pressure

Less than 1,000 psi

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Maximum Temperature

Less than 150° F

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

Minimum Temperature

REACH

RoHS

Seal Material

Finish

Gender

Thread Type

3 Products

Air-Inflatable Plugs

Style C

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. They’re better for lower-pressure applications than water-inflatable plugs. Inflate them with a hand pump; an air compressor may overinflate the plug and cause damage.

Plugs with a chain or eyebolt can be tethered through either so they don't get lost or stuck in your pipes during installation. For easy removal once testing is complete, pull on your tether.

With Zinc-Plated Steel Chain/Ring

Style C

Ribbed Body—Plugs with a ribbed texture have better traction against pipe walls than plugs with a smooth texture. When sealing oily or polished walls, they’ll resist slipping.

Maximum Air Back Pressure—Maximum air back pressure is the amount of pressure a plug can withstand without moving.

Maximum Water Back Pressure—Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

	For Pipe		Deflated			Max. Back Pressure
Style	Size	ID	Dia.	Ht.	Chain Lg.	Air, psi	Water, ft. of head	Req. Inflation Pressure, psi	Temp. Range, ° F	Seal Material	Body Texture		Each
C	3 to 4	2.80" to 4.25"	2 5/8"	5 3/16"	12"	17	40	40	-20 to 125	Natural Rubber	Ribbed	3058K23	000000

Air- and Water-Inflatable Plugs

Penetrate tight pipe junctures with the most flexible expansion plugs we offer. To inflate with air, use a hand pump (sold separately). Whether you fill with air or water, a pressure relief valve will prevent over expanding.

Maximum Air Back Pressure—Maximum air back pressure is the amount of pressure a plug can withstand without moving.

Maximum Water Back Pressure—Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

For Pipe		Deflated		Max. Back Pressure			Water Inlet				Material
Size	ID	Dia.	Ht.	Air, psi	Water, ft. of head	Req. Inflation Pressure, psi	Thread Type	Hose Size	Gender	Temp. Range, ° F	Seal	Fitting	Features		Each



	3 to 4	2.75" to 4.25"	2 11/16"	9"	13	30	50	GHT	3/4	Female	35 to 95	Natural Rubber	Brass	Pressure-Relief Valve, Strap Handle, Tire Thread Inflation Valve	2437K53	000000

Air- and Water-Inflatable Plugs for Wye-Joints

These extra-long plugs allow you to seal off two pipes at the same time. They have two separate inflation chambers to release back pressure gradually and prevent splash back as water clears the drain line. To inflate with air, use a hand pump (sold separately). Whether you fill with air or water, a pressure relief valve will prevent over expanding.

Maximum Air Back Pressure—Maximum air back pressure is the amount of pressure a plug can withstand without moving.

Maximum Water Back Pressure—Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

For Pipe		Deflated		Max. Back Pressure			Water Inlet				Material
Size	ID	Dia.	Ht.	Air, psi	Water, ft. of head	Req. Inflation Pressure, psi	Thread Type	Hose Size	Gender	Temp. Range, ° F	Seal	Fitting	Features	Includes		Each



	3 to 4	2.75" to 4.25"	2 1/2"	23 1/2"	13	30	60	GHT	3/4	Female	35 to 95	Natural Rubber	Brass	Pressure-Relief Valve, Strap Handle, Tire Thread Inflation Valve	4-ft. Lg. Air Hose	2437K54	0000000