The AirTAC GR300-08 AirTAC Low-Pressure Air Regulator, G1/4 is a genuine G-series air pressure regulator. It holds a stable downstream pressure over the range 0.05 - 0.4 MPa (7 - 58 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 GR300-08 is an AirTAC GR-series pressure regulator in the size 300 frame with a G1/4 (1/4 in) female port. This is the low-pressure (L) type, so its setting range goes up to 0.4 MPa, and the code confirms a round pressure gauge on the psi scale is fitted. It regulates compressed air only, accepts a maximum inlet pressure of 1.0 MPa (145 psi), and works across -20 to 70 C - a wider temperature window than the rest of the G family. As a pure regulator it contains no filter and no bowl, so there is nothing to drain. The J code means no mounting bracket is supplied; the GR body is also panel-mountable.
This is a genuine AirTAC part. The GR line spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, and can be ordered as the standard type for settings up to 0.9 MPa, with or without a bracket, with an embedded square gauge or an external round gauge in MPa, psi or bar scales, and in PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GR300-08 AirTAC Low-Pressure Air Regulator, G1/4 |
|---|---|
| Series | GR300 pressure regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Regulating range | 0.05 - 0.4 MPa (7 - 58 psi) |
| Pressure type | Low-pressure 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, 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". |
| L | Low-pressure type — 0.05 - 0.4 MPa (7 - 58 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. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| G | G (BSPP) 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 - 0.4 MPa (7 - 58 psi) |
|---|---|
| One size down | GR200 |
| One size up | GR400 |
| Line order | Filter first, then regulator, then lubricator |
Fixture clamps that must not exceed a set holding pressure are fed through this regulator: the low-pressure type keeps the setting within the 0.4 MPa window, and the fitted psi gauge lets the setter read the clamp pressure directly.
Spray and coating heads in a lab or small paint booth need gentle, stable air. This size 300 regulator with a G1/4 connection sits in the drop line, and the psi round gauge gives the operator a clear readout at the point of use.
Conveyor guide-rail cylinders on a bottling line run at low pressure to avoid crushing containers. This low-pressure GR regulator holds the line pressure down to the required setting, with the psi gauge visible for quick line checks.
Start with the port step: size 300 with a G1/4 port suits lines running 1/4 in air supply, while sizes 200 to 600 step up to 1 in for larger demand - match the size to the flow your circuit needs. Choose the low-pressure (L) type, as here, when the downstream setting must stay at or below 0.4 MPa; the standard GR type covers settings up to 0.9 MPa. Pick the gauge scale you read on site - MPa, psi or bar - and the thread family: PT is the standard, with G (BSPP) and NPT available as order options. Decide whether you need the mounting bracket; this unit is ordered without one, and GR is also panel-mountable.
One honest note on sizing: AirTAC publishes regulator flow as curves, not as a single rated number, so we cannot quote a rated flow here. Send us your application details and we will confirm the flow figures from the datasheet before you order.
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 rated flow, Cv or SCFM number for this unit. Tell us your application and we will confirm the relevant flow figures from the datasheet on request before you order.
The L in the model code marks the low-pressure type, whose setting range goes up to 0.4 MPa. If your circuit needs settings up to 0.9 MPa, order the standard GR300-08 instead (without the L). Both types share the same 1.0 MPa (145 psi) maximum inlet pressure and -20 to 70 C operating range.
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.