The AirTAC AirTAC GFR300-08 Filter Regulator G1/4 Auto Drain psi Gauge 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 a single 300-size body with a G1/4 (BSPP) port. This configuration is fitted with an automatic drain, so collected condensate is discharged without manual attention; the standard 40 um filter element handles general-purpose air preparation. The regulator is the standard type with an adjustment range of 0.15-0.9 MPa (20-130 psi), and an embedded square gauge graduated in psi is included so the set pressure can be read at a glance. A reverse/check valve is fitted, and the polycarbonate bowl suits non-freezing installations from -5 to 70 C. Maximum inlet pressure is 1.0 MPa (145 psi).
This is a genuine AirTAC part. The GFR family is published in 200, 300, 400 and 600 sizes with ports from 1/8 to 1 inch, thread options G (BSPP) or NPT alongside the PT standard, manual or differential-pressure drains as alternatives to this automatic drain, a 5 um element (code W) in place of the standard 40 um, and optional external round gauges with MPa, psi or bar scales. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application on request.
| Model | AirTAC GFR300-08 Filter Regulator G1/4 Auto Drain psi Gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) 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 — square, 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. 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). |
| F | Gauge shape: Square. 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. |
| G | G (BSPP) 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) |
Point-of-use clean, regulated air for a machining centre's pneumatic tool clamps and chip-clearing blasts, with the automatic drain keeping condensate out of the valve stack and the psi gauge letting maintenance set the circuit pressure directly.
Filtering and regulating the air feeding conveyor stopper cylinders and diverters on a packaging line, where the 40 um element protects directional valves and the check valve helps hold the set downstream pressure.
A bench-side air preparation drop in a general assembly plant, combining water and particle removal with pressure regulation for air tools and small clamps, with automatic condensate discharge suiting an unattended drop leg.
Choose the size and port step against the air demand of the circuit: the GFR300 with its G1/4 port sits in the middle of the 200/300/400/600 range, and stepping up a size gives a larger port and more flow capacity. Drain type is a real choice: this unit has an automatic drain, while manual and differential-pressure versions are available where a simpler or pressure-dependent discharge is preferred. Filter grade is 40 um standard here; specify the 5 um W grade if downstream equipment needs finer filtration. The embedded square gauge in psi is fitted as coded (F2); an external round gauge with MPa, psi or bar scale is an option, as is the no-gauge N build. Thread is G (BSPP) on this unit; PT is the catalogue standard and NPT is an order option. Note this J-coded build ships without a mounting bracket, and the K-coded reverse/check valve is fitted. Flow for the GFR 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes GFR-series flow as performance curves rather than a single rated figure, so we do not quote a l/min, m3/h or SCFM number. Tell us your application and we will confirm the flow data from the datasheet and check the 300-size, G1/4 unit against your demand on request.
The A in the code GFR30008AJF2GK means the bowl drain is automatic: condensate is discharged without anyone opening the drain. The catalogue also offers manual drain (code M) and differential-pressure drain (blank) on GFR units, so you can pick the drain style that suits how the drop leg is attended.
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.