Airtac PYW Y-Type Reducing Tee Fitting PYW12-8D
The AirTAC Airtac PYW Y-Type Reducing Tee Fitting PYW12-8D is a genuine different diameter union y for push-in tube connection, rated 0 - 1.0 MPa (0 - 10 kgf/cm2) with a 1.5 MPa proof pressure.
- TypeDifferent diameter union Y
- SeriesPYW
- 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 PYW Y-Type Reducing Tee Fitting PYW12-8D
The PYW12-8D is an AirTAC different diameter union Y, a three-leg tube-to-tube fitting that takes a single Dia 12 mm main line and splits it into two Dia 8 mm branch lines in one push-in body. Because it is a Y rather than a tee, the branch legs leave at an angle, so flow turns more gently and the assembly sits flatter against a machine frame. The D suffix makes the whole body black, not just the release button, which suits dark enclosure interiors and painted guarding where a grey fitting would stand out.
As a resin one-touch part it is rated 0-1.0 MPa (0-10 kgf/cm2) working pressure, 1.5 MPa proof pressure, and it also holds vacuum down to -750 mmHg (10 Torr), so the same union can serve a negative-pressure branch. Temperature range is -20 to +70 C. Push the tube home and the stainless spring gasket and chuck grip the OD; press the POM release ring to free it. The seal is an NBR O-ring and the rated tubing is soft nylon or polyurethane.
Airtac PYW Y-Type Reducing Tee Fitting PYW12-8D Technical Specifications
| Model | Airtac PYW Y-Type Reducing Tee Fitting PYW12-8D |
|---|---|
| Type | Different diameter union Y |
| Series | PYW |
| 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 PYW Y-Type Reducing Tee Fitting PYW12-8D
| PYW | Different diameter union Y. |
|---|---|
| 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 PYW Y-Type Reducing Tee Fitting PYW12-8D Is Used
Packaging machine drop lines
On a horizontal flow-wrapper, a Dia 12 mm nylon trunk runs the length of the frame; this Y drops two Dia 8 mm legs down to the sealing-jaw cylinders, halving the fitting count compared with a tee plus a separate reducer.
Rotary indexing table circuit
A Dia 12 mm feed ring around an indexing table splits into two Dia 8 mm branches, one per workhead cylinder, so both heads share the supply without an extra junction body in the crowded centre.
Extrusion line blow-off ring
Dia 12 mm polyurethane ring main at a plastics extruder feeds Dia 8 mm air-knife nozzles that strip moisture off the profile; the black body disappears against the dark machine guarding.
Is the Airtac PYW Y-Type Reducing Tee Fitting PYW12-8D the Right Part?
Dia 12 mm is the largest tube OD this catalogue carries, so there is no larger PYW to step up to; PYW12-8D is the top of the different-diameter Y ladder. The step down from it is PYW10-6, which pairs a Dia 10 trunk with Dia 6 branches - choose that when your supply line and actuators are one size smaller and you want lower internal volume per leg. If your two branch circuits are a different pair of sizes, other PYW combinations exist within the 4 to 12 mm range.
Tube OD must match exactly on all three legs: the Dia 8 ports will not grip 1/4 inch (6.35 mm) tube even though the sizes look close, so keep Dia 8 tubing on the branches and Dia 12 on the trunk. With no threaded port on this part, the thread sealing question disappears entirely - there is no sealant to apply and nothing to torque. If you need the split to pass through a panel instead of sitting in the line run, a PM bulkhead union with a separate reducer is the alternative shape.
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 PYW Y-Type Reducing Tee Fitting PYW12-8D FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), vacuum to -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. It is a tube-to-tube union Y with a Dia 12 mm trunk port and two Dia 8 mm branch ports, no thread, black body, for soft nylon or polyurethane tubing only.
The PYW already has the diameter change built into the body: two legs are Dia 8 and one is Dia 12, so you buy and install one part instead of a PE tee plus a PG reducer. The angled branch legs also route tube around corners more cleanly than a perpendicular tee, and one fewer joint means one fewer potential leak point on a Dia 12 supply line.
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