The AirTAC AirTAC GFR300-08 Filter Regulator 1/4 in NPT, 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 automatic 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 sets downstream pressure in a single body, so one unit does the job of a separate filter and regulator. This configuration is the 300 size with a 1/4 in NPT port, a 5 um filter element (the finer W grade, versus the standard 40 um), an automatic drain that expels collected condensate without manual attention, and a built-in reverse/check valve that holds the downstream setting if upstream supply is interrupted. The fitted round gauge reads in MPa, and the standard regulator covers an adjustment range of 0.15-0.9 MPa (20-130 psi).
This is a genuine AirTAC part. The GFR line is offered in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, manual or automatic drains, 40 um or 5 um elements, gauge and scale choices, and G/NPT thread options. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing). Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application.
| Model | AirTAC GFR300-08 Filter Regulator 1/4 in NPT, 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, MPa 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". |
| A | Drain: Automatic 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). |
| C | Gauge shape: Round. C is round, F is square. |
| 1 | Gauge scale: MPa. 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) |
Feeding clean, regulated air to a machining centre's tool-change cylinders and pneumatic clamps, where the 5 um element protects close-tolerance valves from particulate and the check valve holds clamp pressure if the shop supply dips.
Pressure regulation for conveyor-mounted diverters, reject pushers and bag-sealing cylinders on a packaging line, with the automatic drain handling condensate on equipment that runs unattended across shifts.
Supplying a set pressure to air cylinders and grippers in a robotic assembly cell, where the round MPa gauge gives operators a visible setpoint and the 5 um grade keeps pilot valves from fouling.
Size and port step up together: 200, 300, 400 and 600 cover 1/8 in through 1 in, and the 300 with a 1/4 in NPT port suits mid-range pneumatic circuits - but always size against required flow, not just the existing pipe thread. This unit carries the 5 um W element; choose it where downstream valves and cylinders need finer filtration than the standard 40 um grade. The automatic drain suits unattended or hard-to-reach installations; a manual drain (M) is the choice where you want condensate emptied on a fixed schedule. The round MPa gauge is fitted here; square embedded gauges and psi or bar scales are also available. Thread is NPT on this code, with G (BSPP) and PT orderable as catalogue options. A mounting bracket is included.
One honest note on sizing: AirTAC publishes flow for this family as curves, not a single rated number, so we cannot quote a rated flow here. Send us your application details and we will confirm the datasheet figures before you order.
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 GFR series as performance curves, not as a single rated number, so we do not quote a rated flow figure here. Tell us your inlet pressure, set pressure and expected air demand, and we will confirm the datasheet curve and correct sizing for your application before you order.
The W in the code GFR30008AC1WTK specifies the finer 5 um filter element instead of the standard 40 um grade, and the A specifies an automatic drain that discharges collected condensate on its own. Together they suit installations where downstream valves need fine filtration and the unit cannot be drained by hand on a schedule.
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.