The AirTAC AirTAC GFR300-08 Filter Regulator NPT 1/4, 5 um Element is a genuine G-series filter regulator: water separation, 5 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 GFR300-08 is an AirTAC GFR300-series filter regulator: water and particulate filtration plus downstream pressure regulation combined in a single body. This configuration has 1/4 in NPT ports, a 5 um filter element (the W code; 40 um is the standard grade), a manual drain bowl, and a round pressure gauge with a bar scale. The standard regulator adjusts from 0.05 to 0.9 MPa (7-130 psi), maximum inlet pressure is 1.0 MPa (145 psi), and the operating temperature range is -5 to 70 C, non-freezing. The bowl on this size is polycarbonate, and a mounting bracket is included.
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 (differential-pressure, automatic or manual), 40 um or 5 um filter grades, gauge scales in MPa, psi or bar, and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so we confirm the datasheet and flow figures for your application on request.
| Model | AirTAC GFR300-08 Filter Regulator NPT 1/4, 5 um Element |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 5 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 — round, bar 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 3 | Gauge scale: bar. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeding clean, regulated air to the tool-change clamps and pneumatic actuators on a machining centre, where the 5 um element protects valves from swarf-laden, wet shop air.
Supplying the pusher and diverter cylinders on a bottling or carton-packing conveyor, with the regulator set to the pressure the diverters were designed for.
Conditioning the compressed air feeding a bench-top test rig or pilot rig, where the 5 um grade and a stable, manually set regulated pressure keep instruments and cylinders behaving repeatably.
Size this unit by the port step and the flow your line needs: GFR300 sits in the middle of the range with 1/4 in ports, and larger sizes (400, 600) carry bigger ports for higher demand. Choose the drain to match the duty: manual drain (this unit) means an operator drains the bowl on a schedule; automatic or differential-pressure drain suits unattended installations. Pick the 5 um element (as fitted here) when downstream equipment needs finer filtration than the 40 um standard. The gauge can be ordered with MPa, psi or bar scales, and the thread is available as PT (standard), G or NPT - this unit is NPT. A bracket is included. Flow 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 curves rather than a single rated figure, so we do not quote one number. Tell us your operating pressure and the air demand of your equipment, and we will confirm the flow from the datasheet curves on request before you order.
The M code in GFR300-08MC3WT specifies a manual drain: an operator opens the drain at the bottom of the polycarbonate bowl to release collected water. Automatic or differential-pressure drain versions are available in the same size if the installation is unattended or drains are easily forgotten; the manual version suits stations visited regularly as part of routine checks.
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.