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 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 AirTAC GFR300-08 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one compact body. This 300-size unit carries a 1/4 in NPT port, an automatic drain that expels collected condensate without manual attention, a 40 um standard filter element, the low-pressure regulator type, and an embedded square gauge scaled in MPa. The polycarbonate bowl lets you see the condensate level at a glance, and a mounting bracket is included for panel or wall fixing. Maximum inlet pressure is 1.0 MPa (145 psi) and the working 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 in, PT as the standard thread with G and NPT as order options, a choice of differential-pressure, automatic or manual drains, 40 um standard or 5 um (W) filtration, and gauge options. Flow is published as curves rather than a single rated figure, so ask us to confirm sizing or any datasheet value for your application before ordering.
| 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 | 0.15 - 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, MPa 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". |
| 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. C is round, F is square. |
| 1 | Gauge scale: MPa. 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. |
| (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) |
Feeds filtered, regulated air to clamps and fixtures on a CNC machining cell, where the automatic drain keeps condensate out of the circuit between shifts and the low-pressure regulator holds a gentle, consistent clamp force.
Supplies clean, regulated air to sealing jaws and forming cylinders on a packaging conveyor, with the 40 um element protecting valves from water and debris and the square gauge giving operators a visible setpoint.
Conditions supply air for bench-top test rigs and pneumatic instruments that need low, stable pressures, combining water and particulate removal with regulation in a single 1/4 in NPT unit.
Start with the port step: this 300-size unit takes a 1/4 in NPT connection, so match it to your downstream line size and the flow curve for the size rather than to a single rating. Choose the drain to suit access: automatic drain (this model) suits installations that are not checked daily, manual drain suits attended stations, and the differential-pressure default drains on a pressure drop. Pick the filter grade for the duty: 40 um standard for general air prep, 5 um (code W) where finer particulate protection matters. The embedded square gauge is fitted here with an MPa scale; psi and bar scales and an external round gauge are alternatives. PT is the standard thread, with G and NPT as catalogue options to order. Because flow is published as curves and not a single rated number, send us your application details and we will confirm sizing against the datasheet before you order.
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 this family as curves, not as a single rated figure, so we do not quote a l/min, m3/h or SCFM number. Send us your application details and we will confirm the flow and sizing against the datasheet on request before you order.
The L in the code marks the low-pressure regulator type, intended for duties that call for lower downstream pressures than the standard version; the exact adjustment range for this type is not published in the material we hold, so we will confirm it on request. The A marks the automatic drain, which expels collected condensate from the polycarbonate bowl without manual attention - a good fit for installations that are not checked every day.
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.