The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 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 GFR-series filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single compact body. This 300-size unit is configured for a 1/4 in NPT port, manual bowl drain, standard 40 um filtration, and the low-pressure regulator type. It comes fitted with an external round gauge scaled in psi and a reverse (check) valve, and is supplied without a mounting bracket. The transparent PC (polycarbonate) bowl lets you see accumulated condensate at a glance, and the manual drain lets you release it on your own schedule.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, optional 5 um filtration (code W), automatic or differential-pressure drains, G (BSPP) or NPT thread options, and gauge or no-gauge variants. Flow is published as curves rather than a single rating, so we confirm the datasheet and sizing figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT 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. |
| 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. |
| T | NPT 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) |
Clean, regulated air at a machine tool's pneumatic drop: the 40 um element strips water and swarf-laden particulate before the regulator sets a stable low-pressure supply to tool-clamp and coolant-skirt circuits, with the check valve holding downstream pressure if upstream supply dips.
On a packaging conveyor, diverting cylinders and bag-seal actuators need air that is dry, filtered and held at a gentle set pressure. The GFR300-08 filters and regulates at the line drop, the psi gauge gives operators a visible setpoint, and the manual drain is emptied during shift checks.
A lab air bench feeding low-pressure pneumatic fixtures benefits from the low-pressure regulator type: filtered air at a controlled, modest pressure for delicate apparatus, with the round psi gauge for precise operator adjustment and the check valve preventing backflow into the supply.
Size and port set the capacity envelope: the 300 size with its 1/4 in NPT port suits compact drops and point-of-use supply, while stepping up to 400 or 600 increases port size and flow capacity. Because flow is published as curves rather than a single rated figure, ask us to confirm sizing against your application before ordering. This unit is already fixed on several choices: manual drain (simple, operator-controlled condensate release), 40 um standard filtration (specify the W variant if you need 5 um), the low-pressure regulator type, a round psi gauge, a reverse/check valve, and no bracket. Thread is NPT here; PT is the standard thread and G (BSPP) is also a catalogue option if you need a different connection.
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, not as a single rated number, so we do not quote a rated flow figure. Tell us your application and we will confirm the datasheet flow curve and check the sizing for you before you order.
The manual drain means you release accumulated condensate from the PC bowl yourself during routine checks, rather than relying on an automatic or differential-pressure drain. The L code marks the low-pressure regulator type, intended for circuits controlled at modest set pressures; its exact regulation range is not published in the material we hold, so we confirm it on request.
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.