The AirTAC GFR300-08 AirTAC Filter Regulator G1/4 Low-Pressure PSI 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 differential-pressure 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 GFR-series filter regulator: one body that removes water and particulate from compressed air and regulates downstream pressure. This configuration is the low-pressure type (code L), intended for circuits that run below standard line pressure - the exact adjustment range for the low-pressure type is not published, so we confirm it on request. It carries a 40 um filter element, a differential-pressure drain on the polycarbonate bowl, an embedded square gauge scaled in psi, and a fitted reverse/check valve (code K). Porting is G1/4 (BSPP); PT is the standard thread and G or NPT are order options. No mounting bracket is included with this code. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 inch, plus options for automatic or manual drains, a 5 um element (code W), gauge scale, and a mounting bracket. Flow for this series is published as curves rather than a single rated figure, so ask us to confirm sizing and any datasheet figure for your application.
| Model | GFR300-08 AirTAC Filter Regulator G1/4 Low-Pressure PSI |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) 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 | Differential-pressure 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". |
| (blank) | Drain: Differential-pressure 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. |
| G | G (BSPP) 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) |
Supplying filtered, reduced-pressure air to the hold-down cylinders on a woodworking press, where clamp force must be set well below standard shop-air pressure and held steady through the cycle.
Conditioning air ahead of spray guns on a small paint line: the 40 um element strips water and grit from the supply while the regulator holds a gentle, repeatable atomising pressure.
Feeding low-pressure air jets and thread-tension rollers on textile machinery, with the fitted check valve helping hold the set pressure if the upstream supply dips.
Size and port step together: 200, 300, 400 and 600 cover 1/8 to 1 inch ports, so choose the size whose published flow curve clears your worst-case air demand - we will read the curve with you. Where a bowl is fitted you can pick differential-pressure draining (this unit), automatic (code A) or manual (code M). The filter element is 40 um standard; specify W for 5 um. Gauges are embedded square as standard with an optional external round gauge in MPa, psi or bar scales. Thread is PT as standard with G and NPT as order options, and a bracket can be specified where the code omits one. Because flow is published as curves rather than one rating, 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 this series as curves, not a single rated figure, so we do not quote a number here. Send us your operating pressure and air demand and we will confirm the sizing from the datasheet before you order.
The L marks the low-pressure regulator type, intended for circuits that run below standard line pressure. The exact adjustment range for the low-pressure type is not published on the sheet we work from, so we confirm it on request. Everything else decodes normally: G1/4 port, 40 um element, differential-pressure drain, square psi gauge, fitted check valve and no bracket.
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.