Airtac PP Pipe Plug PP8
The AirTAC Airtac PP Pipe Plug PP8 is a genuine plug for push-in tube connection, rated 0 - 1.0 MPa (0 - 10 kgf/cm2) with a 1.5 MPa proof pressure.
- TypePlug
- SeriesPP
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure1.5 MPa
- Temperature-20 to +70 °C
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac PP Pipe Plug PP8
The PU8 is an AirTAC PU straight union, a one-touch fitting that joins two lengths of soft nylon or polyurethane tubing of the same Dia 8 mm outside diameter back to back with no threaded port in between. Both ends work the same way: push the 8 mm tube fully home and the internal chuck grips it under the stainless spring gasket, press the POM release ring evenly toward the body and the tube slides free for rework or routing changes.
This is the resin/brass one-touch profile, not the metal BP line: working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure down to -750 mmHg (10 Torr), proof pressure 1.5 MPa and a temperature span of -20 to +70 C. Because the PU union is tube-to-tube, no thread sealant or port tape is involved at all - the only seal points are the two NBR O-rings around the tube shanks, so assembly is simply cut, insert, done.
Airtac PP Pipe Plug PP8 Technical Specifications
| Model | Airtac PP Pipe Plug PP8 |
|---|---|
| Type | Plug |
| Series | PP |
| Connection | Push-in one-touch |
| Working pressure | 0 - 1.0 MPa (0 - 10 kgf/cm2) |
|---|---|
| Negative pressure | -750 mmHg (10 Torr) |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Applicable tubing | Soft nylon or polyurethane tube |
| Thread standard | PT (Rc tapered) unless the code says otherwise |
POM release button and chuck, aluminium-alloy guide, stainless spring gasket, NBR O-ring; body brass or PBT depending on the part. AirTAC publishes flow as a characteristic curve rather than a single figure, so no L/min value is listed.
Model Code: Airtac PP Pipe Plug PP8
| PP | Plug. |
|---|---|
| 4 / 6 / 8 / 10 / 12 | Tube outside diameter in mm (3.2 mm exists on the mini series). |
| M5 / 01 / 02 / 03 / 04 | Thread: M5x0.8, 1/8", 1/4", 3/8", 1/2" (M3 on the mini series). |
| D | Black. Blank = grey. |
Fitting & Sealing Notes
- check Cut the tube square and clean before pushing it home, or the seal will leak.
- check Push until it stops, then pull back to check the chuck has gripped.
- check To release, press the collet ring fully in and pull the tube out.
- check Threaded parts arrive with sealant on the thread; M5 sizes use a sealing gasket.
- check Match the tube OD exactly - a 6 mm fitting will not hold 1/4" tube.
Where the Airtac PP Pipe Plug PP8 Is Used
Splicing a run on a pick-and-place gantry
When a delivered 8 mm air line arrives short of the gripper manifold, a PU8 union extends it cleanly mid-run, and the release ring lets the line be pulled apart later when the head is serviced or re-routed.
Air-knife feeds on a packaging conveyor
Distributor runs to conveyor-mounted air-knife nozzles often need an extra few metres of 8 mm tube; a PU8 splices the extension in line without adding a threaded joint that could work loose under vibration.
Repairing damaged sections in a workshop drop
Where a scuffed or cut 8 mm polyurethane drop from an overhead line has to be trimmed back, cutting out the bad length and bridging the gap with a PU8 restores the run without re-piping from the manifold.
Is the Airtac PP Pipe Plug PP8 the Right Part?
Step down to PU6 (Dia 6) when you are splicing lighter runs that feed small actuators, jets or sensors, and step up to PU10 when the run has to carry a wider column of air to a larger cylinder or valve island; every step changes only the bore the chuck accepts, the pressure figures stay identical. If you need a union with a threaded end instead of two tube ends, that is a different family: a PC male connector screws into the port, and if the joint must pass through a sheet-metal wall, the PM bulkhead union (Dia 8 takes an M16x1 locknut) is the shape that does it. One hard rule: the tubing OD must match exactly. A Dia 8 union will not seal on 5/16 inch or 1/4 inch tube, whatever the ID looks like.
Quick checklist
- ✓ Tube outside diameter matches exactly
- ✓ Thread size and standard match the port
- ✓ Working pressure within 0 - 1.0 MPa (0 - 10 kgf/cm2)
- ✓ Temperature within -20 to +70 °C
Airtac PP Pipe Plug PP8 FAQ
The PU8 is a tube-to-tube straight union taking Dia 8 mm outside diameter soft nylon or polyurethane tube on both ends, with no threaded port. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), it tolerates negative pressure down to -750 mmHg (10 Torr), the proof pressure is 1.5 MPa, and the operating temperature range is -20 to +70 C. It is part of the resin/brass one-touch line with a POM release ring and NBR sealing O-rings.
No. Both chucks in a PU union are cut for one tube OD, so the PU8 only grips 8 mm tube on each side. For a step change use the PG different-diameter straight union family - for example a PG8-4 steps Dia 8 down to Dia 4, and an 8-to-6 step is available in the same family. If the junction also needs a threaded outlet, the PKG reducer triple branch union combines sizes on one body.
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