The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 5 um 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 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration has 1/4 in NPT ports, a 5 um filter element (the finer of the two catalogue grades), a differential-pressure drain that discharges collected condensate automatically when the pressure differential across the element rises, an embedded square gauge scaled in bar, and a built-in reverse/check valve that holds downstream pressure if the upstream supply is lost. It ships without a mounting bracket.
This is a genuine AirTAC part. The GFR family is available in 200, 300, 400 and 600 sizes with port sizes from 1/8 to 1 inch, a choice of differential-pressure, automatic or manual drains, 40 um or 5 um filtration, MPa, psi or bar gauge scales, and PT, G or NPT threads. Rated flow is published as curves rather than a single figure, so ask us to confirm the datasheet and sizing for your application.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT 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, bar 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". |
| (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). |
| F | Gauge shape: Square. 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. |
| 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Clean, regulated 1/4 in air supply for tool-change cylinders and clamping fixtures on a machining centre, with the 5 um element protecting sensitive pilot valves and the check valve holding clamp pressure during a supply dip.
Filtering and regulating the air feeding carton-sealing and labelling heads on a packaging line, where the differential-pressure drain keeps condensate out of the actuators without daily manual draining.
A stable, filtered air point for bench-top test rigs and analytical instruments, with the bar-scaled square gauge giving a clear set-point readout and the 5 um grade guarding fine metering components.
Start with the port and size: this unit is the 300 size with 1/4 in NPT ports; step up to the 400 or 600 size if your line needs more flow capacity, or down to the 200 size for compact circuits. The 5 um element (code W) suits air that feeds precision valves, cylinders or instrumentation; the standard 40 um grade is enough for general shop-air protection. The differential-pressure drain is the default and needs no operator attention; choose automatic for continuous condensate removal or manual where drains are checked routinely. Gauge scale here is bar; MPa and psi scales are also available. NPT is an order option alongside the PT standard and G (BSPP) thread, and a bracket can be specified if you want panel mounting. 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR300 series as curves rather than a single rated figure, so we do not quote a number. Tell us your application and required flow and we will confirm the datasheet figures and correct sizing for you on request.
The W code in GFR30008JF3WTK selects the 5 um filter grade instead of the standard 40 um, giving finer protection for downstream components. The K code fits a reverse/check valve, which holds downstream pressure if the upstream supply drops. Both are catalogue options you can order with or without.
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.