Polypropylene Tube End Caps

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78 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

For Use With: Nylon Plastic: Air, Water
Polycarbonate Plastic: Air
Polypropylene Plastic: Water
Temperature Range: See table
Tubing: Use with soft (Durometer 40A-65A) PVC plastic or silicone rubber

Made of plastic, these couplings are lighter in weight than metal luer lock couplings. They're a popular choice in labs because of their versatility—they fit any other luer lock plug, socket, syringe, or needle. Quick to attach and detach, they’re often used in lines that are frequently disconnected. They have a compact body for easy installation in tight spaces. Use them in low-pressure applications. These couplings are open-flow style, so there is no shut-off valve to stop the flow when they’re separated.

Polypropylene couplings won’t absorb water and lose strength, even in high-humidity environments. They also stand up to chemicals, including solvents.

Plugs with a locking ring are more secure than those without a locking ring. Give the ring a half turn to lock these couplings in place. You can’t remove the locking ring.

Plugs without a locking ring are quicker to install and remove than those with a locking ring. Also known as luer slip couplings, all they need is a light push to secure. Add a snap-on ring (sold separately) to lock your coupling in place and color code your line.

Note: For a complete coupling, order a plug and a socket.

Snap-On Locking Rings for Plugs Without Locking Rings

Nylon Plastic
Color	Clarity	Pkg. Qty.		Pkg.
Black	Opaque	10	000000000	00000
Blue	Opaque	10	000000000	0000
Green	Opaque	10	000000000	0000
Red	Opaque	10	000000000	0000
White	Opaque	10	000000000	0000
Polypropylene Plastic
White	Semi-Clear	10	000000000	0000

Caps for Plugs

Polypropylene Plastic
Color	Clarity	Max. Pressure	Temp. Range, °F	Pkg. Qty.		Pkg.
White	Semi-Clear	40 psi @ 72° F	35° to 150° F	10	000000000	00000

End Plugs

With Locking Ring

Without Locking Ring

Tie plugs with a tether ring to equipment so they’re always where you need them.

Plugs with a vented tip release fluid and gases trapped below the cap, making them a good choice for vacuum applications.

Polypropylene Plastic
Color	Clarity	Max. Pressure	Temp. Range, °F	Features	Locking Ring Included	Pkg. Qty.		Pkg.
Open Tip
White	Semi-Clear	40 psi @ 72° F	35° to 150° F	__	With Locking Ring	10	000000000	00000
White	Semi-Clear	Not Rated	Not Rated	__	Without Locking Ring	10	000000000	0000
White	Semi-Clear	Not Rated	Not Rated	Tether Ring	Without Locking Ring	10	000000000	0000
White	Semi-Clear	Not Rated	Not Rated	Vented Tip	With Locking Ring	10	000000000	0000
Closed Tip
White	Semi-Clear	Not Rated	Not Rated	__	With Locking Ring	10	000000000	0000

Combo Cap/Plug

Combo cap/plugs close off a plug on one end and a socket with the other. They save space by doing the job of both a cap and an end plug.

Polypropylene Plastic
Color	Clarity	Max. Pressure	Temp. Range, °F	Locking Ring Included	Pkg. Qty.		Pkg.
Open Tip
White	Semi-Clear	Not Rated	Not Rated	With Locking Ring	10	000000000	00000

High-Flow Quick-Disconnect Tube Couplings for Air and Water

Temperature Range: Acetal Plastic: 32° to 180° F
Polypropylene Plastic: 32° to 160° F
Tubing: Use with soft or firm (Durometer 55A-95A) nylon plastic, polyethylene plastic, polypropylene plastic, polyurethane rubber, PVC plastic or TPE plastic
Specifications Met: Acetal Plastic: FDA Compliant 21 CFR 177.2470
Polypropylene Plastic: FDA Compliant 21 CFR 177.1520

A spring-free flow path allows more air or water to pass through these tube couplings at lower line pressures than other quick-disconnect couplings. This reduces turbulence, foaming, bubbles, and blockage. They have a shut-off valve that stops the flow when the coupling is disconnected, so air or water won’t leak from your line. Unlike couplings with a button release, these have a safety slide to reduce accidental separation from bumps or drops. They’re often used in laboratories, pharmaceutical facilities, and other sterile environments. All are FDA compliant for direct contact with food.

When you insert the plug into the socket, it’ll connect with a click. To disconnect, slide the latch on the socket and remove the plug.

Polypropylene plugs and sockets are flexible yet tough, so they keep their shape and strength after repeated use. They are more water resistant than acetal plugs and sockets and can be completely submerged.

Caps keep dirt and debris out of plugs—just slide them on the end.

End plugs fit in the end of a socket to keep out dirt and debris.

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

Caps

Polypropylene Plastic
For Plug OD	Coupling Size	Color	Clarity	Max. Pressure		Each
9/16"	1/8	Orange	Opaque	90 psi @ 72° F	0000000	00000
9/16"	3/16	Orange	Opaque	90 psi @ 72° F	0000000	0000
11/16"	1/4	Orange	Opaque	90 psi @ 72° F	0000000	0000
11/16"	3/8	Orange	Opaque	90 psi @ 72° F	0000000	0000
1"	1/2	Orange	Opaque	90 psi @ 72° F	0000000	0000
1"	5/8	Orange	Opaque	90 psi @ 72° F	0000000	0000
1"	3/4	Orange	Opaque	90 psi @ 72° F	0000000	0000

End Plugs

Polypropylene Plastic
Plug OD	Coupling Size	Color	Clarity	Max. Pressure		Each
9/16"	1/8	Orange	Opaque	90 psi @ 72° F	0000000	00000
9/16"	3/16	Orange	Opaque	90 psi @ 72° F	0000000	0000
11/16"	1/4	Orange	Opaque	90 psi @ 72° F	0000000	0000
11/16"	3/8	Orange	Opaque	90 psi @ 72° F	0000000	0000
1"	1/2	Orange	Opaque	90 psi @ 72° F	0000000	0000
1"	5/8	Orange	Opaque	90 psi @ 72° F	0000000	0000
1"	3/4	Orange	Opaque	90 psi @ 72° F	0000000	0000

Brass Compression Tube Fittings for Air and Water

For Use With: Air, Lubricated Air, Water
Temperature Range: See table
Tubing: Use with firm or hard (Durometer 1A-95A or Rockwell 15T 1-15T 60) nylon plastic, polyethylene plastic, polypropylene plastic or polyurethane rubber
Specifications Met: SAE J512, except metric sizes

A single sleeve (ferrule) compresses the tubing as you tighten the nut, creating a strong seal. The nut and sleeve are included. Fittings are also known as flareless fittings. They are brass for good corrosion resistance.

Caps

For Tube
OD	Wall Thick.	Material	Max. Pressure	Temp. Range, °F		Each
1/4"	0.03"	Brass	300 psi @ 72° F	-65° to 250°	000000000	00000

Plugs

Install plugs on the end of fittings to block the flow of air or water.

For Tube, mm
OD	Wall Thick.	Material	Max. Pressure	Temp. Range, °F		Each
4	1	Brass	2100 psi @ 72° F	-75° to 550°	00000000	00000
6	1	Brass	2100 psi @ 72° F	-75° to 550°	0000000	000
8	1	Brass	1900 psi @ 72° F	-75° to 550°	00000000	000
10	1	Brass	1300 psi @ 72° F	-75° to 550°	00000000	0000

Tube Supports For Use With Air and Lubricated Air

Temperature Range:
Inch: -65° to 250° F
Metric: -40° to 250° F
Tubing:
Tube supports with 135 psi @ 75° F or 165 psi @ 75° F max. pressures: Use with firm or soft polyethylene plastic or PVC plastic
Tube supports with all other max. pressures: Use with firm or soft (Durometer 1A-95A) polyethylene plastic or polypropylene plastic

For Tube
OD	ID	Tube Support Material	Max Pressure	Pkg. Qty.		Pkg.
1/4"	1/8"	Brass	300 psi @ 72° F	10	000000000	000000
1/4"	5/32"	Brass	165 psi @ 75° F	10	000000000	00000
4mm	2mm	Brass	3300 psi @ 72° F	25	000000000	00000
4mm	2.5mm	Brass	3300 psi @ 72° F	10	000000000	00000
8mm	5.5mm	Brass	1450 psi @ 72° F	5	000000000	0000
10mm	7mm	Brass	1080 psi @ 72° F	5	000000000	00000
10mm	7.5mm	Brass	1080 psi @ 72° F	5	000000000	00000

Tube Supports For Use With Air, Lubricated Air, and Water

Temperature Range: -75° to 550° F
Tubing: Use with hard or firm (Rockwell 15T 1-15T 60) nylon plastic, polyethylene plastic, polypropylene plastic, or polyurethane rubber

For Tube
OD	ID	Tube Support Material	Max Pressure		Each
4mm	2.7mm	Brass	2100 psi @ 72° F	00000000	00000
6mm	4mm	Brass	2100 psi @ 72° F	0000000	000
8mm	6mm	Brass	1900 psi @ 72° F	00000000	000
10mm	8mm	Brass	1300 psi @ 72° F	00000000	000

Nuts

Short

Long

For Use With:
Short nuts: Air, Water, Lubricated Air
Long nuts: Air, Water, Cutting Oil, Fuel Oil, Hydraulic Fluid, Mineral Oil
Temperature Range: See table
Tubing:
Short nuts: Use with firm or hard (Durometer 1A-95A or Rockwell 15T 1-15T 60) nylon plastic, polyethylene plastic, polypropylene plastic, or polyurethane rubber
Long nuts: Use with firm or hard (Durometer 1A-95A) copper, nylon plastic, polyethylene plastic, polypropylene plastic, or polyurethane rubber
Specifications Met: See table

For Tube
OD	Wall Thick.	Nut Material	Max. Pressure	Temp. Range, °F	Specifications Met		Each
Short Nuts
1/4"	0.03"	Brass	300 psi @ 72° F	-65° to 250°	SAE J512	000000000	00000
4mm	1mm	Brass	2100 psi @ 72° F	-75° to 550°	__	00000000	000
6mm	1mm	Brass	2100 psi @ 72° F	-75° to 550°	__	0000000	000
8mm	1mm	Brass	1900 psi @ 72° F	-75° to 550°	__	00000000	000
10mm	1mm	Brass	1300 psi @ 72° F	-75° to 550°	__	00000000	0000
Long Nuts
1/4"	0.03"	Brass	300 psi @ 72° F	-65° to 250°	UL Listed	000000000	0000

Sleeves

For Use With:
UL Listed sleeves: Air, Water, Cutting Oil, Fuel Oil, Hydraulic Fluid, Mineral Oil
All other sleeves: Air, Water, Lubricated Air
Temperature Range: See table
Tubing:
UL Listed sleeves: Use with firm or hard (Durometer 1A-95A) copper, nylon plastic, polyethylene plastic, polypropylene plastic, or polyurethane rubber
All other sleeves: Use with firm or hard (Durometer 1A-95A or Rockwell 15T 1-15T 60) nylon plastic, polyethylene plastic, polypropylene plastic, or polyurethane rubber
Specifications Met: See table

For Tube		Sleeve
OD	Wall Thick.	Material	Color	Max. Pressure	Temp. Range, °F	Specifications Met	Pkg. Qty.		Pkg.
1/4"	0.03"	Acetal Plastic	White	300 psi @ 72° F	-65° to 250°	SAE J512	10	000000000	00000
1/4"	0.03"	Brass	__	300 psi @ 72° F	-65° to 200°	UL Listed	10	000000000	0000
									Each
4mm	1mm	Brass	__	2100 psi @ 72° F	-75° to 550°	__	__	00000000	000
6mm	1mm	Brass	__	2100 psi @ 72° F	-75° to 550°	__	__	0000000	000
8mm	1mm	Brass	__	1900 psi @ 72° F	-75° to 550°	__	__	00000000	000
10mm	1mm	Brass	__	1300 psi @ 72° F	-75° to 550°	__	__	00000000	000

Push-to-Connect Fittings for Food and Beverage

Temperature Range: 35° to 140° F
Tubing: See table
Specifications Met: See table

Also known as instant fittings, these connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. To disconnect fittings with a release ring, push on the release ring and pull the tubing out of the fitting.

Polypropylene fittings have excellent impact and abrasion resistance. They meet NSF/ANSI standards for safe use with food. Some are also FDA compliant for indirect contact with food.

Black fittings have excellent UV resistance and are suitable for outdoor environments.

Caps

White
For Tube OD	Material	Release Ring Color	Max. Pressure	For Tube Hardness Rating	For Tube Hardness	Specifications Met		Each
1/4"	Polypropylene Plastic	White	150 psi @ 72° F	Firm, Hard	Durometer 50D-90D	NSF/ANSI 51, NSF/ANSI 61	00000000	00000
3/8"	Polypropylene Plastic	White	150 psi @ 72° F	Hard	Durometer 50D-70D	NSF/ANSI 58, NSF/ANSI 372, FDA Compliant 21 CFR 176.170	00000000	0000
1/2"	Polypropylene Plastic	White	150 psi @ 72° F	Hard	Durometer 50D-70D	NSF/ANSI 58, NSF/ANSI 372, FDA Compliant 21 CFR 176.170	00000000	0000
Black
1/4"	Polypropylene Plastic	Black	150 psi @ 72° F	Hard	Durometer 50D-70D	NSF/ANSI 58, NSF/ANSI 372, FDA Compliant 21 CFR 176.170	00000000	0000
3/8"	Polypropylene Plastic	Black	150 psi @ 72° F	Hard	Durometer 50D-70D	NSF/ANSI 58, NSF/ANSI 372, FDA Compliant 21 CFR 176.170	00000000	0000
1/2"	Polypropylene Plastic	Black	150 psi @ 72° F	Hard	Durometer 50D-70D	NSF/ANSI 58, NSF/ANSI 372, FDA Compliant 21 CFR 176.170	00000000	0000

Plugs

Plugs insert into the push-to-connect end of another fitting.

White
Tube Stem OD	Material	Max. Pressure	Specifications Met		Each
1/4"	Polypropylene Plastic	150 psi @ 72° F	NSF/ANSI 51, NSF/ANSI 61	0000000	00000
5/16"	Polypropylene Plastic	150 psi @ 72° F	NSF/ANSI 51, NSF/ANSI 61	00000000	0000
3/8"	Polypropylene Plastic	150 psi @ 72° F	NSF/ANSI 51, NSF/ANSI 61	0000000	0000
1/2"	Polypropylene Plastic	150 psi @ 72° F	NSF/ANSI 51, NSF/ANSI 61	0000000	0000
Black
1/4"	Polypropylene Plastic	150 psi @ 72° F	NSF/ANSI 58, NSF/ANSI 372, FDA Compliant 21 CFR 176.170	0000000	000
5/16"	Polypropylene Plastic	150 psi @ 72° F	NSF/ANSI 58, NSF/ANSI 372, FDA Compliant 21 CFR 176.170	00000000	0000
3/8"	Polypropylene Plastic	150 psi @ 72° F	NSF/ANSI 58, NSF/ANSI 372, FDA Compliant 21 CFR 176.170	0000000	0000
1/2"	Polypropylene Plastic	150 psi @ 72° F	NSF/ANSI 58, NSF/ANSI 372, FDA Compliant 21 CFR 176.170	0000000	0000

Push-to-Connect Fittings for Plastic Tubing—High-Purity

For Use With: Air, Nitrogen, Water
Temperature Range: 32° to 100° F
Tubing: Use with polypropylene plastic

Also known as instant fittings, these connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. To disconnect, push on the release ring and pull the tubing out of the fitting. Fittings are produced in a clean room and are double bagged to prevent dirt and moisture from contaminating the inside. They are polypropylene, which has excellent impact and abrasion resistance.

Plugs

Plugs insert into the push-to-connect end of another fitting.

Tube Stem OD	Material	Color	Max. Pressure		Each
1/4"	Polypropylene Plastic	White	100 psi @ 72° F	00000000	00000
3/8"	Polypropylene Plastic	White	100 psi @ 72° F	00000000	0000
1/2"	Polypropylene Plastic	White	100 psi @ 72° F	00000000	0000
4mm	Polypropylene Plastic	White	140 psi @ 72° F	00000000	0000
6mm	Polypropylene Plastic	White	140 psi @ 72° F	00000000	0000
8mm	Polypropylene Plastic	White	140 psi @ 72° F	00000000	0000
12mm	Polypropylene Plastic	White	140 psi @ 72° F	00000000	0000

Luer Lock Tube Couplings for Plastic and Rubber Tubing—High-Purity

For Use With: Air, Water
Temperature Range: Nylon Plastic: -50° to 275° F
Polyolefin Plastic: Up to 355° F
Polypropylene Plastic: -5° to 150° F
Tubing: Use with soft or firm (Durometer 50A-95A) polyolefin plastic, PVC plastic, silicone rubber, TPE plastic, or TPU plastic

To prevent contamination, these couplings are cleaned, double bagged, and packaged in a clean room. This makes them a great choice for applications where cleanliness is critical, such as semiconductor manufacturing. Known for their versatility, they fit any luer lock plug, socket, syringe, or needle. They’re quick to attach and detach, so they’re often used in lines that are frequently disconnected. Thanks to their compact body, they fit in tight spaces. Use them in low-pressure applications.

Note: For a complete coupling, order a plug and a socket. Polypropylene couplings resist moisture and chemicals, including solvents. They also stand up to impact and abrasion.

Plugs with a locking ring are more secure than those without a locking ring. Give the ring a half turn to lock them in place. You can’t remove the locking ring.

Caps for Plugs

Polypropylene Plastic
Color	Clarity	Max. Pressure	Environmental Rating	Pkg. Qty.		Pkg.
White	Semi-Clear	Not Rated	ISO Class 7	5	00000000	00000

End Plugs

Polypropylene Plastic
Color	Clarity	Max. Pressure	Environmental Rating	Locking Ring Included	Pkg. Qty.		Pkg.
Open Tip
White	Semi-Clear	Not Rated	ISO Class 7	With Locking Ring	5	00000000	00000

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How to Identify and Measure Fittings

Plastic Luer Lock Tube Couplings for Air and Water

High-Flow Quick-Disconnect Tube Couplings for Air and Water

Brass Compression Tube Fittings for Air and Water

Push-to-Connect Fittings for Food and Beverage

Push-to-Connect Fittings for Plastic Tubing—High-Purity

Luer Lock Tube Couplings for Plastic and Rubber Tubing—High-Purity