The AirTAC GFR300-08 AirTAC Filter Regulator, G1/4, 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 manual drain and regulates 0.05 - 0.9 MPa (7 - 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: water and particulate filtration plus pressure regulation combined in one body. This configuration takes a G1/4 (BSPP) port, carries the standard 40 um filter element, and has a manual drain on its polycarbonate bowl. The regulator is the low-pressure (L) type, and the code includes an external round pressure gauge reading psi. No mounting bracket is supplied with this code.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, and options include automatic or differential-pressure drains, a 5 um (W) filter element, embedded square or external round gauges with MPa, psi or bar scales, and PT, G or NPT threads. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Flow for this family is published as curves rather than a single rated figure, so ask us to confirm the datasheet for your application.
| Model | GFR300-08 AirTAC Filter Regulator, G1/4, Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, psi scale |
| Reflux valve | Not fitted |
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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 130 psi)). |
| L | Low-pressure type. 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. |
| (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. |
| (blank) | No reverse-flow valve (the default). |
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) |
On a fixture-clamping circuit that works at reduced setpoints, the low-pressure regulator sets the clamp force while the 40 um element keeps debris away from valve spools and seals.
Feeding actuators and air cylinders along a packaging conveyor, this unit conditions the supply at each station - dropping out water and particles and holding a steady regulated pressure.
On benchtop lab equipment that needs clean, reduced-pressure air, the 40 um element and manual-drain bowl give simple, visible servicing between runs.
Size 300 with a G1/4 port suits lines built on 1/4 in piping; step up to size 400 or 600 when the flow curve for your demand calls for it - we can check the curve with you. This code pairs a manual drain (bleed the polycarbonate bowl periodically; choose an automatic or differential-pressure drain code if that does not suit your service routine) with the standard 40 um element; specify W for 5 um filtration. The gauge here is the external round type reading psi; embedded square gauges and MPa or bar scales are alternatives on other codes. Thread is G (BSPP); PT is the standard and NPT is an order option. No mounting bracket is included. Flow is published as curves, not a single rating, so ask us to confirm sizing against your application before ordering. As a low-pressure (L) type, this regulator's exact adjustment range is not published - confirm it with us.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. Without the K option, air cannot flow back 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 number here. Send us your demand - working pressure and air consumption - and we will confirm the sizing from the datasheet on request.
M in the code selects the manual drain: you bleed the polycarbonate bowl periodically instead of relying on an automatic or differential-pressure drain. C2 selects the external round gauge with a psi scale; embedded square gauges and MPa or bar scales are available on other codes. This is also the low-pressure (L) regulator type, so confirm its adjustment range with us before ordering.
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.