The AirTAC GR300-08 AirTAC Air Pressure Regulator NPT1/4 is a genuine G-series air pressure regulator. It holds a stable downstream pressure over the range 0.05 - 0.9 MPa (7 - 130 psi) with PT1/4" ports, and ships with a pressure gauge. A regulator does not filter the air — put a GF filter upstream, or use a GFR filter regulator, when water and particulate must also be removed.
The AirTAC GR300-08 is a pressure regulator in the GR300 size class, built to hold a steady downstream air pressure from a variable supply line. It carries no filter and no bowl - regulation is its entire job - and this configuration is fitted with an external round pressure gauge scaled in psi, so the set pressure can be read directly at the unit. The outlet pressure is adjustable across 0.05-0.9 MPa (7-130 psi), with a maximum inlet (working) pressure of 1.0 MPa (145 psi).
This is a genuine AirTAC part for compressed air, rated for -20 to 70 C - a wider temperature window than the rest of the G-series. The GR line is available in sizes 200, 300, 400 and 600 with a choice of PT, G (BSPP) or NPT threads, gauge scale (MPa, psi or bar), a low-pressure type, and an optional reverse/check valve. We confirm flow and datasheet figures on request, since flow is published as curves rather than a single rating.
| Model | GR300-08 AirTAC Air Pressure Regulator NPT1/4 |
|---|---|
| Series | GR300 pressure regulator |
| Port size | PT1/4" (NPT thread) |
| Regulating range | 0.05 - 0.9 MPa (7 - 130 psi) |
| Pressure type | Standard type |
| Bracket | Fixing bracket included |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -20 to +70 °C |
| Pressure gauge | Fitted — round, psi scale |
| Reflux valve | Not fitted |
| Mounting | Panel mounting; optional fixing bracket |
Specifications follow the official AirTAC G-series air-preparation data. Note the GR temperature range is -20 to +70 °C, wider than the other G-series units. A regulator has no bowl and no filter element, so there is no filtering grade. Flow curves, weight and outline dimensions are not published in our data set — ask us and we will confirm from the factory datasheet.
| GR300 | G-series pressure regulator, 300 body — sets the port range. |
|---|---|
| 08 | Port size PT1/4". This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| (blank) | Standard type — 0.05 - 0.9 MPa (7 - 130 psi). Blank is standard, L is the low-pressure type. |
| (blank) | Fixing bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| T | NPT thread. PT is the default; G is BSPP and T is NPT. |
| (blank) | No reverse-flow valve (the default). |
Field order is size, port, type, bracket, gauge, gauge shape, scale, thread, reflux — a blank position takes the default. Example: GR300-08LNK is a 300 body, PT1/4", low-pressure type, no gauge, with reflux valve.
A larger body carries a larger port and holds set pressure better as flow rises. AirTAC publishes flow only as curves, so size the body from your peak demand with headroom rather than from a single rated figure.
| This model | GR300 · PT1/4" · 0.05 - 0.9 MPa (7 - 130 psi) |
|---|---|
| One size down | GR200 |
| One size up | GR400 |
| Line order | Filter first, then regulator, then lubricator |
Set a stable, reduced pressure feeding the machine's pneumatic actuators, clamps and tool-change circuits, with the psi gauge readable at the regulator instead of back at the compressor room.
On a packaging or bottling line, hold a consistent downstream pressure to the cylinders that drive pushers, diverters and sealing heads, so cycle behaviour stays repeatable shift to shift.
At a point-of-use drop off a factory main header, step the header pressure down to the level a downstream cell or workstation actually needs, protecting tools and components from full line pressure.
Start with the port step: GR300-08 is the 1/4 in (NPT) member of the GR300 size, and the 200/300/400/600 ladder exists so the regulator body matches the pipe size and flow demand of the line - step up a size where the circuit draws more air. Set the downstream pressure anywhere in the 0.05-0.9 MPa (7-130 psi) range; if the circuit must run below that, the GR low-pressure type (L) covers settings up to 0.4 MPa. Choose the gauge scale to suit the shop: this unit carries a round psi gauge, while MPa and bar scales and an embedded square gauge are the other catalogue options.
Thread is NPT here because the code ends in T; PT is the standard and G (BSPP) is also orderable, so match the thread to the fittings actually on the machine. A bracket is included and the GR is also panel-mountable. Because flow is published as curves rather than a single rated figure, ask us to confirm sizing against your application before ordering.
Quick checklist
Without a reflux valve, air cannot flow back through the regulator — order the K option if reverse flow is required. A regulator does not remove water or particulate; that is the filter's job.
AirTAC publishes regulator flow as performance curves rather than a single rated figure, so we do not quote a Cv, SCFM or l/min number. Send us your line size and air demand and we will confirm the sizing against the datasheet curves on request before you order.
The trailing C2 in GR30008C2T specifies an external round gauge scaled in psi. The catalogue also offers an embedded square gauge and MPa or bar scales, so if your plant reads in different units or you prefer the square style, ask us for the corresponding GR300 variant.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity, thread type (PT / G / NPT), gauge scale and destination. We confirm price, availability and lead time — usually within 7-8 hours.