
The AirTAC Airtac PEG T-Type Concentric Reducing Tee Fitting PEG8-6D is a genuine different diameter tee for push-in tube connection, rated 0 - 1.0 MPa (0 - 10 kgf/cm2) with a 1.5 MPa proof pressure.
The PEG8-6D is an AirTAC PEG different diameter union tee: a three-way tube-to-tube fitting whose Dia 8 leg is reduced to a Dia 6 leg, all in black. Three soft nylon or polyurethane tubes simply push home; inside each port a stainless spring gasket and chuck grip the tube wall, and the POM release ring frees it again when you need to re-route a line. No spanners, no ferrules, no thread anywhere on the body.
This is the resin one-touch profile, not the metal line: 0 to 1.0 MPa working pressure, -750 mmHg vacuum, 1.5 MPa proof pressure and -20 to +70 C service. The body is PBT with a POM release button and NBR seals. Because the D suffix sits on a non-PC series, it recolours the whole body to black, not just the button - useful where a dark fitting disappears against black cable trunking or machine guarding.
| Model | Airtac PEG T-Type Concentric Reducing Tee Fitting PEG8-6D |
|---|---|
| Type | Different diameter tee |
| Series | PEG |
| 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.
| PEG | Different diameter tee. |
|---|---|
| 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. |
On a cartoning or flow-wrap machine, a Dia 8 header along the frame can tee down to Dia 6 drops that feed compact gripper and sealing cylinders at each station.
Bench-top liquid handling and sample handling stations often run a Dia 8 supply and step to Dia 6 lines at the tee, keeping the smaller tubing tidy inside instrument enclosures.
Behind a black electrical or pneumatic cabinet wall, the all-black PEG8-6D splits a Dia 8 feed into a Dia 6 branch without adding visible grey plastic to the panel interior.
Step down to PEG6-4 when you want a Dia 6 main run feeding a Dia 4 actuator or sensor line; step up to PEG10-8 for a Dia 10 header dropping to this same Dia 8 size. Each step trades a little capacity for a smaller, cheaper downstream tube, so match the reduction to what the smallest leg actually feeds rather than the supply header. Flow through the fitting follows the smaller bore, so oversizing the tee cannot rescue an undersized tube run.
The two tube bores are fixed: a Dia 6 tube will seat only in the Dia 6 port and a Dia 8 tube only in the Dia 8 port, and no adaptor inside this fitting will bridge the mismatch. If your run needs a thread on the branch instead of a third tube, use a PKD male reducer triple branch rather than forcing a union tee to do a threaded job.
Quick checklist
It is a Dia 8 x Dia 6 different diameter union tee in black. Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, vacuum to -750 mmHg (10 Torr), temperature -20 to +70 C. It accepts soft nylon or polyurethane tube only, Dia 8 in the larger port and Dia 6 in the reduced port.
The port sizes are fixed, but the position is free: push the Dia 8 tube into the Dia 8 leg and the two Dia 6 tubes into the reduced legs. What you cannot do is mix sizes within a port - a Dia 6 tube in the Dia 8 port will not seal. Always cut the tube square and push it fully home until it bottoms, then tug to confirm the chuck has gripped.
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