The AirTAC GFR300-08 AirTAC Filter Regulator, PT1/4, Low-Pressure is a genuine G-series filter regulator: water separation, 40 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT1/4" ports, a automatic drain and regulates 0.15 - 0.9 MPa (20 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The GFR300-08 is an AirTAC GFR300 filter regulator: filtration and pressure regulation combined in a single body. Water and particulate are removed from the compressed air by a 40 um element, and the downstream pressure is set with the built-in regulator. This unit is the low-pressure type, so it suits circuits that run at reduced working pressures; its exact adjustment range is not published and we confirm it on request. It has PT1/4 (1/4 in) ports with PT thread as standard, an automatic drain that expels collected condensate without manual attention, an embedded square gauge reading in psi, and a reverse/check valve fitted to hold the set pressure against backflow. No mounting bracket is included.
This is a genuine AirTAC part. The GFR family is available in sizes 200, 300, 400 and 600 with a choice of port, thread (PT standard, G and NPT as order options), drain type, filter grade (40 um standard, 5 um with code W) and gauge scale. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application before ordering.
| Model | GFR300-08 AirTAC Filter Regulator, PT1/4, Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (PT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Low-pressure type |
| Adjusting mechanism | Balanced type |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -5 to +70 °C (unfreeze) |
| Drain type | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, psi scale |
| Reflux valve | Fitted (reverse flow permitted) |
Specifications follow the official AirTAC G-series air-preparation data. The regulating band is set by the drain type: automatic and differential-pressure drains regulate 0.15 - 0.9 MPa, a manual drain regulates 0.05 - 0.9 MPa. The low-pressure type adjusts over a lower band than standard; we confirm the exact figures from the factory datasheet. Air must not freeze in the unit. Flow curves, weight and outline dimensions are not published in our data set — ask us and we will confirm from the factory datasheet.
| GFR300 | G-series filter regulator, 300 body — sets the port range. |
|---|---|
| 08 | Port size PT1/4". This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| A | Drain: Automatic drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 130 psi)). |
| L | Low-pressure type. Blank is standard, L is the low-pressure type. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT thread. PT is the default; G is BSPP and T is NPT. |
| K | Reverse-flow (reflux) valve fitted. |
Field order is size, port, drain, type, bracket, gauge, shape, scale, grade, thread, reflux — a blank position takes the default. Example: GFR300-08 is a 300 body, PT1/4", differential drain, standard type, bracket included, gauge fitted, 40 µm, PT thread, no 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. The GFR600 uses an aluminium-alloy bowl; the 200, 300 and 400 bodies use PC.
| This model | GFR300 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
A low-pressure filter regulator ahead of spray guns cleans the air of water and particles, holds a steady reduced pressure at the gun, and the automatic drain keeps condensate out of the finish without daily attention.
Feeding light-duty pneumatic cylinders on carton-forming and sealing stations, the unit filters the shop air, sets the working pressure for gentle product handling, and the check valve holds the setting against backflow.
Supplying pneumatic valve actuators outdoors, the unit removes moisture and particulate before the actuators, regulates the supply to the actuator rating, and the automatic drain copes with condensate where access is limited.
Choose the size by port and required flow: this 300-size unit carries PT1/4 (1/4 in) ports; larger sizes step up to bigger ports and more flow. Drain options are differential-pressure (default), automatic (fitted here) or manual - automatic suits unattended installations. Filter grade is 40 um standard; specify code W for 5 um where finer filtration is needed. Gauge choices are the embedded square gauge (psi scale on this unit; MPa and bar scales are also available) or an optional external round gauge. Thread is PT as standard, with G (BSPP) and NPT as order options, and a bracket is optional (not fitted here; code J). The reverse/check valve (code K) is fitted on this unit. Flow is published as curves, not a single rating, so please ask us to confirm sizing against your application before ordering.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR series as curves rather than a single rated figure, so we do not quote a rated flow number. Tell us your application and we will confirm the flow figures from the datasheet and check the sizing for you before you order.
The A in the code means an automatic drain: collected condensate is expelled from the PC bowl without manual intervention. The L means this is the low-pressure regulator type, intended for circuits running at reduced pressures; its exact adjustment range is not published, so we confirm it on request. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
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.