3 1/2 Pipe Size Fittings | McMaster-Carr

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Reducing Adapter

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Stainless Steel

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Ring with Bolt Holes

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Stainless Steel

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Low Stress-to-Seal Flanges

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Maximum Pressure @ Temperature

150 psi @ 70° F

15 psi @ 72° F

100 psi @ 72° F

120 psi @ 72° F

125 psi @ 72° F

150 psi @ 72° F

175 psi @ 72° F

200 psi @ 72° F

240 psi @ 72° F

250 psi @ 72° F

285 psi @ 72° F

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127 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

Pipe and Fittings

Iron and Steel Threaded Pipe and Fittings

Low-Pressure Iron and Steel Threaded Pipe Fittings

Low-Pressure Iron and Steel Threaded Pipe Fittings

For pressures up to 300 psi

Low-Pressure Iron and Steel Threaded Pipe Flanges

Low-Pressure Iron and Steel Threaded Pipe Flanges

Create an access point in lines up to 285 psi; also known as Class 150 flanges

Galvanized Iron and Steel Threaded Pipe and Fittings

Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

For pressures up to 300 psi

Plastic Pipe and Fittings

Standard-Wall Plastic Pipe Nipples and Pipe for Water

Standard-Wall Plastic Pipe Nipples and Pipe for Water

The industry standard for low-pressure water lines; also known as Schedule 40

Clear-View Standard-Wall Plastic Pipe Nipples and Pipe for Water

Clear-View Standard-Wall Plastic Pipe Nipples and Pipe for Water

See inside low-pressure plumbing and water supply lines; also known as Schedule 40

ABS Threaded Cleanout Plugs

ABS Threaded Cleanout Plugs

Close off your drain cleanout pipe

Brass and Bronze Threaded Pipe and Fittings

Low-Pressure Brass and Bronze Threaded Pipe Fittings

Low-Pressure Brass and Bronze Threaded Pipe Fittings

For pressures up to 300 psi

Brass and Bronze Threaded Cleanout Plugs

Brass and Bronze Threaded Cleanout Plugs

Close off your drain cleanout pipe

Stainless Steel Unthreaded Pipe and Fittings

Easy-Access Low-Pressure Stainless Steel Clamp-On Pipe Fittings

Easy-Access Low-Pressure Stainless Steel Clamp-On Pipe Fittings

Turn the T-handle to tighten and loosen without tools

Galvanized Iron and Steel Unthreaded Pipe and Fittings

Low-Pressure Galvanized Iron and Steel Clamp-On Pipe Fittings

Low-Pressure Galvanized Iron and Steel Clamp-On Pipe Fittings

Tighten the bolts to join pipe in air, vacuum, and gravity-flow systems up to 15 psi

Iron and Steel Unthreaded Pipe and Fittings

FM-Approved Low-Pressure Iron and Steel Unthreaded Pipe Flanges

FM-Approved Low-Pressure Iron and Steel Unthreaded Pipe Flanges

Add an access point to fire water mains and sprinkler systems

Other Products

Protective Caps

Protective Caps

Protect just about anything, including pipe, flanges, screws, and posts

Tube Straights

Join lengths of tube to send contents in one direction

Pipe Repair Clamps

Pipe Repair Clamps

Fix small holes and cracks in pipe without taking your system apart

Expansion Plugs

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

Protective Plugs

Protective Plugs

Insert into holes in pipe, containers, panels, and parts to keep out debris

Grommets

Protect wire, cable, and cords from holes with sharp or rough edges

Pipe Gaskets

Form tight seals when connecting flanged pipe fittings

Conduit Locknuts

Conduit Locknuts

Secure threaded conduit fittings to knockouts in outlet boxes or enclosures

Pipeline Fluid Blockers

Pipeline Fluid Blockers

Temporarily block the flow between pipe flanges as you work downstream; also known as paddle blinds

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)