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 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-series filter regulator: filtration and pressure regulation combined in one body. It removes water and particulate from compressed air with a 40 um element, then regulates downstream pressure, and it carries a manual drain bowl in PC (polycarbonate). This configuration is a low-pressure type with a reverse/check valve fitted, a round psi gauge, and a mounting bracket included, on a PT1/4 (1/4 in) port with PT thread as the standard.
This is a genuine AirTAC part. The GFR family is published in sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, drain choices (differential-pressure, automatic or manual), a 5 um filter option (code W), gauge and scale choices, and G or NPT thread options to order. Flow is published as curves rather than a single rating, so we confirm datasheet figures on request.
| 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 | 0.05 - 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 | 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". |
| 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. |
| (blank) | Mounting bracket included. |
| (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. |
| (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 fixture line that clamps workpieces at reduced air pressure uses the GFR300-08 to filter incoming water and particulate and hold a gentle, stable regulated supply to the clamp cylinders, with the psi gauge giving the operator a direct reading.
A lab bench running air-operated instruments at low pressure takes filtered, regulated air through the GFR300-08; the 40 um element catches pipe scale and condensate is removed via the manual drain at the start of each shift.
A packaging conveyor's divert gates and stoppers run on low-pressure air; the GFR300-08 cleans the supply, regulates it to the gate cylinders' band, and the check valve helps hold the setting against supply dips.
Size and port step up together: 200 through 600, with ports from 1/8 in to 1 in, so pick the size whose flow curve covers your demand. This unit is the low-pressure type, so confirm your working band suits it before ordering. Drain here is manual, meaning an operator drains the bowl; choose automatic or differential-pressure drain if unattended draining matters. Filter grade is the 40 um standard element; the 5 um option is code W. Gauge is the external round type on a psi scale (embedded square gauge is standard; MPa and bar scales exist). Thread is PT as standard, with G (BSPP) and NPT as order options, and the mounting bracket is included. Flow is published as curves, not a single rating, so 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 GFR300 as curves, not as a single rated figure, so we do not quote one number. Tell us your application and we will confirm the flow and sizing from the datasheet on request before you order.
This configuration carries code M, the manual drain: an operator opens the drain to expel collected condensate from the PC bowl. If you prefer the bowl to discharge automatically, the automatic (code A) and differential-pressure (blank) drain options are available in the same series.
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.