The AirTAC GFR300-08 AirTAC Filter Regulator 1/4 in, 5 um, psi gauge 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 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 GFR300-08 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single compact body. This 300-size unit is tapped PT1/4 (1/4 in) and is configured with a 5 um filter element (the finer of the two grades offered), a differential-pressure drain that bleeds condensate automatically whenever the pressure drop across the element rises, and an embedded square gauge reading in psi so the set pressure is visible at a glance. The regulator is the standard type with an adjustment range of 0.15-0.9 MPa (20-130 psi), and the maximum inlet pressure is 1.0 MPa (145 psi). The polycarbonate bowl suits non-freezing compressed-air service from -5 to 70 C, and a mounting bracket is included.
This is a genuine AirTAC part. The GFR filter-regulator family is published in 200, 300, 400 and 600 sizes with ports from 1/8 to 1 in, a choice of differential-pressure, automatic or manual drains, 40 um standard or 5 um fine filtration, square or round gauges with MPa, psi or bar scales, an optional low-pressure regulator type, an optional reverse/check valve, and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application.
| Model | GFR300-08 AirTAC Filter Regulator 1/4 in, 5 um, psi gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (PT thread) |
| Filtering grade | 5 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 — 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 0.15 - 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. |
| (blank) | Mounting bracket included. |
| (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. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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) |
Point-of-use conditioning for a machining centre's pneumatic circuits: the 5 um element strips water and fine particulate before the air reaches tool-clamp and tool-changer valves, while the regulator holds a steady set pressure for consistent clamping action.
Feeding the air cylinders that drive a carton-forming or case-sealing conveyor station: clean, regulated air keeps cylinder stroke timing repeatable through the shift, and the psi gauge lets line staff verify the set pressure without extra tooling.
Conditioning the air routed to spray-equipment actuation and booth controls in a finishing area: the fine 5 um grade and regulation in one body reduce the plumbing footprint at the wall drop while protecting downstream pneumatic components.
Size and port: the 300 frame with its PT1/4 (1/4 in) tap is the middle step of the GFR range; step up to 400 or 600, or down to 200, when the line's required flow demands a different port. Drain: this unit uses the differential-pressure drain, which discharges condensate automatically as the element loads; choose automatic (code A) for continuous unattended drainage or manual (code M) where you want positive operator control. Filtration: the 5 um element fitted here is the finer option - the 40 um standard grade suits general supply lines, while 5 um protects more sensitive downstream components. Gauge: the embedded square gauge reads psi; round external gauges and MPa or bar scales are order options. Thread: PT is standard on this code, with G (BSPP) and NPT available to order. A mounting bracket is included; a low-pressure regulator type and a reverse/check valve are also orderable on this family. Because flow is published as curves and not 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 GFR series as curves rather than a single rated number, so we do not quote a rated flow, Cv or SCFM figure. Tell us your line pressure and the flow your application needs, and we will confirm the sizing against the datasheet curves on request before you order.
The code GFR30008F2W decodes to the finer 5 um filtration grade (W) instead of the 40 um standard element, and the blank drain position selects the differential-pressure drain, which discharges condensate automatically as the pressure drop across the element rises. If you prefer a manual drain or the coarser 40 um grade, those are orderable variants of the same GFR300-08 model.
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.