Keyed Tube Fittings | McMaster-Carr

Filter by

For Use With

Fitting Connection

Flow Control Type

Pipe Size

Material

Quick-Disconnect Component

Band Color

Coupling Size

Gender

Tube ID

Maximum Pressure @ Temperature

Connects To

Minimum Temperature

RoHS

Compliant with Exemptions

Maximum Temperature

180° F

210° F

Maximum Vacuum @ Temperature

REACH

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

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Color

Tube Hardness Rating

Length

Plug Tip Diameter

Plug Tip Length

23 Products

About Measuring Fittings

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

Keyed and Color-Coded High-Pressure Quick-Disconnect Tube Couplings for Air

Prevent mixing the wrong high-pressure lines—these couplings are designed to only connect with a plug or socket of the same color. They’re safe to use with high-pressure lines up to 250 psi. Made of chrome-plated brass, these couplings have excellent corrosion resistance.

To connect the coupling, push the plug into the socket. To disconnect, press the latch on the socket and remove the plug. Barbed plugs and sockets insert into tubing and secure with a clamp.

Note: For a complete coupling, order a plug and a socket with the same coupling size and strip color.

Color-Coded Plugs, Barbed Tube

Blue Strip

Orange Strip

Yellow Strip

Temperature Range: -40° to 180° F
Tubing: Use with soft or firm (Durometer 70A-80A) polyurethane rubber

Open flow plugs give you higher flow rates than valves with shut-off flow control. They also minimize pressure drops across the connection. For the best flow rates, pair an open flow plug with an open flow socket.

						Open Flow
For Tube ID	Coupling Size	Plug OD	Material	Strip Color	Max. Pressure		Each
1/8"	1/8	5/16"	Chrome-Plated Brass	Blue	250 psi @ 72° F	5478K825	000000
1/8"	1/8	5/16"	Chrome-Plated Brass	Orange	250 psi @ 72° F	5478K823	00000
1/8"	1/8	5/16"	Chrome-Plated Brass	Yellow	250 psi @ 72° F	5478K824	00000
1/4"	1/8	5/16"	Chrome-Plated Brass	Blue	250 psi @ 72° F	5478K828	00000

Color-Coded Through-Wall Sockets, Barbed Tube

Blue Strip

Orange Strip

Yellow Strip

Temperature Range: -40° to 180° F
Tubing: Use with soft or firm (Durometer 70A-80A) polyurethane rubber

Also known as bulkhead couplings or panel-mount couplings, through-wall sockets mount through your wall or panel to create an inlet or outlet.

Open flow sockets give you higher flow rates than those with shut-off flow control. They also minimize pressure drops across the connection. For the best flow rates, pair an open flow socket with an open flow plug.

Sockets with a shut-off valve stop the flow when the coupling is separated, so air won’t leak from your line.

Open Flow
For Tube ID	Coupling Size	For Plug OD	Material	Strip Color	Max. Pressure	For Hole Dia.	For Max. Wall Thick.		Each
1/8"	1/8	5/16"	Chrome-Plated Brass	Blue	250 psi @ 72° F	1/2"	1/2"	5478K868	000000
1/8"	1/8	5/16"	Chrome-Plated Brass	Orange	250 psi @ 72° F	1/2"	1/2"	5478K866	00000
1/8"	1/8	5/16"	Chrome-Plated Brass	Yellow	250 psi @ 72° F	1/2"	1/2"	5478K867	00000
With Shut-Off
1/8"	1/8	5/16"	Chrome-Plated Brass	Blue	250 psi @ 72° F	1/2"	1/2"	5478K874	00000
1/8"	1/8	5/16"	Chrome-Plated Brass	Orange	250 psi @ 72° F	1/2"	1/2"	5478K873	00000
1/4"	1/8	5/16"	Chrome-Plated Brass	Blue	250 psi @ 72° F	1/2"	1/2"	5478K876	00000
1/4"	1/8	5/16"	Chrome-Plated Brass	Orange	250 psi @ 72° F	1/2"	1/2"	5478K875	00000

Color/Shape-Match Quick-Disconnect Hose Couplings for Air and Water

Couplings are color coded by shape so you can’t mix hose lines. Only plugs and sockets of the same color and coupling size will fit together. A complete coupling consists of a plug and a socket (both sold separately) that connect and disconnect quickly. Use them if you need frequent access to a line. Plugs and sockets are 303 stainless steel for good corrosion resistance.

Plugs are also known as nipples.

Sockets have a shut-off valve that stops the flow when the coupling is separated, so air or water won’t leak from the line. They are push-to-connect style. To connect, push the plug into the socket until you hear a click. To disconnect, slide the sleeve on the socket forward until the plug ejects.

Note: To ensure a correct fit, make sure that the plug and socket have the same color and coupling size.

Plugs, Female Threaded Pipe

Maximum Pressure: 500 psi @ 72° F
Maximum Vacuum: 28 in. of Hg @ 72° F
Temperature Range: 0° to 210° F

	Plug Tip
Coupling Size	Lg.	Dia.	Pipe Size	Thread Type	Band Material	Plug Shape		Each
Blue Band
303 Stainless Steel
1/4	3/16"	7/16"	1/4	NPT	Polyolefin Plastic	Round	8636T234	000000
3/8	7/32"	1/2"	3/8	NPT	Polyolefin Plastic	Round	8636T314	00000
Green Band
303 Stainless Steel
1/4	3/16"	7/16"	1/4	NPT	Polyolefin Plastic	Round	8636T239	00000
3/8	7/32"	1/2"	3/8	NPT	Polyolefin Plastic	Round	8636T312	00000
Red Band
303 Stainless Steel
1/4	3/16"	7/16"	1/4	NPT	Polyolefin Plastic	Round	8636T261	00000
3/8	7/32"	1/2"	3/8	NPT	Polyolefin Plastic	Round	8636T315	00000

Push-to-Connect Sockets, Female Threaded Pipe

Maximum Pressure: 500 psi @ 72° F
Maximum Vacuum: 28 in. of Hg @ 72° F
Temperature Range: 0° to 210° F

	For Plug Tip
Coupling Size	Lg.	Dia.	Pipe Size	Thread Type	Band Material	For Plug Shape		Each
Blue Band
303 Stainless Steel
1/4	3/16"	7/16"	1/4	NPT	Polyolefin Plastic	Round	8636T199	000000
3/8	7/32"	1/2"	3/8	NPT	Polyolefin Plastic	Round	8636T305	00000
Green Band
303 Stainless Steel
1/4	3/16"	7/16"	1/4	NPT	Polyolefin Plastic	Round	8636T198	00000
3/8	7/32"	1/2"	3/8	NPT	Polyolefin Plastic	Round	8636T266	00000
Red Band
303 Stainless Steel
1/4	3/16"	7/16"	1/4	NPT	Polyolefin Plastic	Round	8636T238	00000
3/8	7/32"	1/2"	3/8	NPT	Polyolefin Plastic	Round	8636T311	00000