The AirTAC GFR300-08 AirTAC Filter Regulator, G1/4, Square 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 manual drain and regulates 0.05 - 0.9 MPa (7 - 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 sets downstream pressure in a single 300-size body with a G1/4 (1/4 in) port. This configuration has a manual drain bowl in polycarbonate, a 40 um standard filter element, and a built-in embedded square gauge scaled in psi, so an operator can read and adjust the working pressure directly at the unit. The standard regulator covers a 0.05-0.9 MPa (7-130 psi) setting range, with a maximum inlet pressure of 1.0 MPa (145 psi) and a working temperature of -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family is available in sizes 200, 300, 400 and 600 with a choice of ports, drain types, 40 um or 5 um (W) filtration, gauge scale, and PT, G or NPT threads. Flow for this series 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 | GFR300-08 AirTAC Filter Regulator, G1/4, Square psi Gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, 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 0.05 - 0.9 MPa (7 - 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 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. |
| (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 and regulates the air to a bench-mounted pneumatic press on a small assembly line, with the psi gauge letting the setter dial in the forming pressure at the machine.
Conditions the air feeding a carton-sealing or wrapping machine, removing water and pipe scale ahead of the machine's directional valves while holding a steady working pressure.
Supplies the cylinders that raise stoppers and divert product on a conveyor line, with the manual-drain bowl emptied during scheduled line checks.
Size 300 with a G1/4 port suits lines running 1/4 in air preparation; step up to size 400 or 600 where the circuit demands more flow, since larger sizes carry larger ports and higher flow capacity. Drain choice matters in practice: this unit has a manual drain, which needs periodic draining by hand, whereas automatic (code A) or differential-pressure (blank) drains offload that task. Filtration is 40 um as fitted here; specify 5 um (code W) where downstream valves or instruments need finer protection. The embedded square gauge in psi is standard, with MPa or bar scales and an external round gauge available as options. Thread is G (BSPP) on this code; PT is the standard series thread and G or NPT are order options. A mounting bracket can be added (this code omits it, J).
Flow for the GFR series is published as curves, not a single rating, so send us your air demand 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, not as a single rated figure, so we do not quote a rated flow number. Send us your application's air demand and we will confirm the sizing from the datasheet on request.
The M in the code GFR30008MJF2G selects a manual drain: collected water must be drained from the polycarbonate bowl by hand at intervals. If you would rather not do this, the same 300-size filter regulator can be ordered with an automatic drain (code A) or the default differential-pressure drain instead.
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.