The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 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 is a 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in one body. This unit is configured with a 1/4 in NPT port, an automatic drain that expels collected condensate without manual attention, a 40 um standard filter element, and an external round gauge reading in psi. Maximum inlet pressure is 1.0 MPa (145 psi), the standard regulation range is 0.15-0.9 MPa (20-130 psi), and the operating temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl suits the 300 size; only size 600 units use an aluminium alloy bowl.
This is a genuine AirTAC part. The GFR series is available in sizes 200, 300, 400 and 600, with port options by size, PT (standard), G or NPT threads, differential-pressure, automatic or manual drains, 40 um or 5 um (W) filter elements, and square or round gauges in MPa, psi or bar scales. Flow is published as curves rather than a single rated figure, so we confirm datasheet and flow figures on request.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 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 | Standard 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, psi 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). 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)). |
| (blank) | Standard 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. |
| (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) |
Point-of-use conditioning for a packaging line's pneumatic cylinders and sealers: the 40 um element strips water and debris before the film-sealing actuators, while the regulator holds a steady working pressure so jaw and clamp motions stay repeatable through the shift.
Feeding the air cylinders that divert, stop and index product on a conveyor line. The automatic drain keeps condensate out of the valve bank without operator rounds, and the psi gauge lets technicians set and verify line pressure at the station.
Conditioning and pressure control for air tools and clamps at a bench assembly cell. The 1/4 in NPT port drops straight into typical tool-supply piping, the round psi gauge gives the operator a visible setpoint, and regulation keeps tool torque consistent.
Choose the GFR300 size step against the flow your line needs: sizes 200, 300, 400 and 600 step up in port and capacity, and this unit sits at the 300 size with a 1/4 in NPT port. The automatic drain on this configuration suits unattended duty; a manual drain (code M) or the differential-pressure default are the alternatives where drainage habits differ. The 40 um element is the standard grade; specify the W option for 5 um filtration where downstream equipment demands finer air. This unit carries an external round gauge on a psi scale; embedded square gauges and MPa or bar scales are the other catalogue choices. NPT is ordered as the thread option here, with PT as the standard and G (BSPP) also available. A mounting bracket can be added where the J (no bracket) configuration does not suit the installation. Flow for the series 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. 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 performance curves, not as a single rated figure, so we do not quote a rated flow number. Send us your application details and we will confirm the flow and datasheet figures for the GFR300-08 on request before you order.
The A in the code GFR30008AJC2T specifies an automatic drain, which expels collected condensate from the bowl without anyone opening it - useful for unattended or hard-to-reach installations. The catalogue alternatives are the differential-pressure drain (the default, blank code) and the manual drain (code M); all three are orderable choices on the same GFR300 body.
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.