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 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is built with a 1/4 in NPT port, an automatic drain that expels collected condensate without manual attention, a 40 um standard filter element, and the low-pressure regulator type for circuits that run at reduced set pressures. A square pressure gauge scaled in MPa is fitted so the set pressure is visible at the unit, and no mounting bracket is included.
This is a genuine AirTAC part. The GFR series is available in sizes 200, 300, 400 and 600 with a choice of PT, G or NPT threads, differential-pressure, automatic or manual drains, a 40 um standard or 5 um (W) filter element, standard or low-pressure regulation, gauge options and scale choices. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures 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. |
| J | Supplied without bracket. |
| (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) |
Filtered, regulated air to the pneumatic clamps on a robotic welding cell, where the low-pressure regulator type lets the circuit run at a reduced set pressure and the automatic drain keeps condensate out of the clamp cylinders.
Supplying clean, regulated air to the cylinders and air jets on a carton-sealing or wrapping line, with the automatic drain handling moisture at a machine that is not attended between shifts and the MPa gauge giving operators a visible set point.
Conditioning the compressed-air drop to a lab bench or pilot rig, where the 40 um element and regulator protect sensitive pneumatic instruments and the low-pressure type matches the modest pressures such benches operate at.
Start with the port step: the 300 size in this code carries a 1/4 in port, and the series steps through 200, 300, 400 and 600 as port and flow capacity rise - match the size to your line's air demand. Choose the drain to suit access: automatic (as fitted here) suits enclosed or infrequently attended installations, manual suits supervised points, and differential-pressure is the catalogue default. The 40 um element is standard; specify the 5 um (W) grade where downstream equipment needs finer filtration. This unit is the low-pressure regulator type, so confirm it against your circuit's set-pressure window before ordering. The square gauge fitted here reads in MPa; psi and bar scales and an external round gauge are order options. Thread is NPT in this code, with PT as the standard and G as an alternative option; a bracket is an option this code omits. Flow is published as curves, not a single rating, so 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 the GFR series as curves rather than a single rated figure, so we do not quote a rated flow, Cv or SCFM number for this unit. Send us your application details and we will confirm the relevant datasheet curve and sizing for the 300-size, 1/4 in port unit before you order.
The A in this code selects the automatic drain, which expels collected condensate from the polycarbonate bowl without anyone opening it - useful where the unit sits in an enclosed cabinet or an unattended line. The catalogue also offers manual and differential-pressure drains, and the 40 um element shown here can be swapped for the 5 um (W) grade at order time.
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.