The AirTAC GFR300-08G AirTAC Filter Regulator, G1/4, Round 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 differential-pressure 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 GFR300-08G is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration is the size-300 unit with a G1/4 (BSPP) port, the standard 40 um filter element, a differential-pressure drain that bleeds collected condensate whenever the pressure differential across the element is high enough, and a fitted round gauge reading in psi so you can set and monitor outlet pressure directly. The regulator is the standard type with an adjustment range of 0.15-0.9 MPa (20-130 psi), the maximum inlet pressure is 1.0 MPa (145 psi), and the operating temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl suits general indoor compressed-air service, and this code carries no mounting bracket and no reverse/check valve.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with matching port sizes, and options include a 5 um filter element (code W), automatic or manual drain, embedded square or external round gauges with MPa, psi or bar scales, and PT, G or NPT threads. Flow is published by AirTAC as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application on request.
| Model | GFR300-08G AirTAC Filter Regulator, G1/4, Round 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 | Differential-pressure 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". |
| (blank) | Drain: Differential-pressure 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. |
| 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) |
Point-of-use conditioning for the clean, regulated air that actuates tool clamps, tool changers and spindle-air seals on a CNC cell, with the psi gauge letting setters verify setting pressure at the machine.
Filtering and regulating the air feeding solenoid valve islands on a cartoning or wrapping line, protecting the valves from water and debris while holding a stable outlet pressure for consistent cylinder motion.
Conditioning the supply to pneumatic stoppers, gates and pushers along a conveyor line, where the differential-pressure drain keeps condensate moving out during operation and the regulator sets gentle, repeatable gate speed.
Start with size and port: 200, 300, 400 and 600 step up in port and flow capacity, so pick the size whose port matches your line and whose flow curve covers your demand. Then choose the drain: differential-pressure (this unit, no action needed in normal service), automatic (positive condensate expulsion) or manual (you drain it yourself). Filter grade is 40 um as standard or 5 um with code W if finer particulate capture is needed. Gauge choice is the embedded square gauge or an external round gauge, with MPa, psi or bar scales - this model has a round psi gauge. Thread is PT as standard with G (BSPP) and NPT as order options; this unit is G-threaded. Bracket is optional (this code has none). Because AirTAC publishes flow as curves rather than a single rating, 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 GFR300 series as curves, not as a single rated figure, so we do not quote a number here. Tell us your operating pressure and air demand and we will confirm the flow from the datasheet and check the sizing for your application on request.
This GFR300-08G has the differential-pressure drain as standard: condensate collected in the polycarbonate bowl is bled off automatically when the pressure drop across the 40 um element rises enough. Choose code A (automatic drain) if you want positive condensate expulsion regardless of differential, or code M (manual drain) if you prefer to drain the bowl yourself during maintenance.
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.