The AirTAC GFR300-08 AirTAC Filter Regulator, NPT 1/4 in, Auto Drain 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 size 300 filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is fitted with a 1/4 in NPT port, an automatic drain that expels collected condensate without manual attention, the standard 40 um filter element, the low-pressure regulation type, a round pressure gauge with MPa scale, and an integrated reverse/check valve. The polycarbonate bowl lets you see the condensate level at a glance, and the unit carries no mounting bracket.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in and options including manual or differential-pressure drains, a 5 um filter element, square or round gauges with MPa, psi or bar scales, and G, NPT or PT threads. Flow figures for this series are published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator, NPT 1/4 in, Auto Drain |
|---|---|
| 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 — round, MPa 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". |
| 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). |
| C | Gauge shape: Round. 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. |
| 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) |
On a paint line, the low-pressure regulation type and 40 um filtration condition and hold the air feeding spray guns, while the automatic drain keeps condensate out of the finish.
Feeding clamp cylinders on a CNC fixture, the GFR300-08 filters the supply, holds a steady low set pressure on the clamps, and the check valve helps hold the circuit if upstream pressure dips.
On a carton-sealing or wrapping machine, the unit supplies filtered, pressure-controlled air to the sealing cylinders, with the automatic drain handling moisture during continuous shifts.
Choose the size 300 / 1/4 in NPT port step against the air consumption of the circuit it feeds, stepping up to size 400 or 600 where the demand is higher. This unit has the automatic drain, which suits unattended or hard-to-reach installations; manual and differential-pressure drains are available elsewhere in the series if you prefer operator-controlled or pressure-differential draining. The standard 40 um element covers general air preparation, while the 5 um (W) element is the choice for finer protection. The round MPa gauge is fitted here; square gauges and psi or bar scales can be ordered. NPT is the thread on this code, with G (BSPP) and PT available as order options, and the J code means no mounting bracket is supplied.
Because flow for the GFR series is published as curves and not as a single rated figure, 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 GFR series as curves rather than a single rated figure, so there is no one rated flow number we can quote. Tell us your application and air demand and we will confirm the sizing against the datasheet curves on request.
The A code means the bowl drain expels collected condensate automatically instead of relying on manual draining or a differential-pressure drain. It suits installations that run unattended or where the bowl is awkward to reach. Manual (M) and differential-pressure (blank) drains are available as alternative order codes.
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.