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 is a compressed-air pressure regulator: its only job is to hold a steady, adjustable downstream pressure from a variable supply line. This GR300-08 configuration is the 300 size with a 1/4 in NPT port, the standard regulator type with a 0.05-0.9 MPa (7-130 psi) adjustment range, a round pressure gauge reading in bar, and no mounting bracket. As a pure regulator it contains no filter and no bowl, so it must be fed by clean, dry air - pair it upstream with a filter if the supply carries water or particulate.
This is a genuine AirTAC part. The GR family spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, optional G (BSPP) or NPT threads in place of the PT standard, low-pressure variants, a check (reverse) valve option, and gauge or no-gauge builds. Flow for this series is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application on request.
| 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 | Supplied without bracket |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -20 to +70 °C |
| Pressure gauge | Fitted — round, bar 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 3 | Gauge scale: bar. 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 and hold the working pressure feeding a benchtop pneumatic press or clamping cylinder, so forming and staking forces stay repeatable shift after shift.
Regulate the supply to a CNC machining centre's air-assist and tool-change circuit, keeping actuator pressures stable as the shop compressor cycles.
Hold a fixed downstream pressure for sealing jaws and pick-and-place cylinders on a packaging line, protecting delicate product handling from supply swings.
Choose the size by the flow your line needs: 200 is the smallest step, and 300 (this unit, 1/4 in port) suits compact machine circuits - step up to 400 or 600 for larger ports and higher flow. Because flow is published as curves and not a single rating, send us your demand and we will confirm sizing against the datasheet before you order. Then pick the decodable options: thread (PT is the standard; G and NPT are order options - this unit is NPT), gauge scale (MPa, psi or bar - this one reads bar) and gauge style (embedded square is standard, external round is optional), plus a check-valve variant if backflow protection is needed. A bracket can be specified if you do not want the no-bracket build, and GR also panel-mounts. GR operates from -20 to 70 C, wider than the rest of the G family, and tolerates up to 1.0 MPa (145 psi) inlet.
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 GR-series performance as flow curves rather than a single rated figure, so no one number is quoted here. Tell us your line demand and we will confirm the datasheet flow figures for this 1/4 in regulator on request before you order.
The code GR30008JC3T decodes as: 300 size, 1/4 in NPT port, J = no mounting bracket, C = external round gauge, scale 3 = bar. The embedded square gauge is the standard build and MPa/psi/bar scales are available, so a different gauge, a bracket, or a G/NPT thread variant can be specified instead if your panel layout needs it.
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.