The AirTAC GFR300-08 AirTAC Filter Regulator 1/4 in PT, 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: one body that first removes water and particulate from compressed air, then regulates downstream pressure. This size 300 unit has a PT 1/4 in port, a fine 5 um filter element (the W grade, one step finer than the 40 um standard), and a differential-pressure drain that bleeds collected condensate automatically whenever the pressure differential across the element is high enough. The built-in regulator covers 0.15-0.9 MPa (20-130 psi), and the embedded square gauge reads in psi so setpoints can be checked at a glance. A reverse/check valve is fitted, holding downstream pressure if the supply side drops, and a mounting bracket is included.
This is a genuine AirTAC part in the GFR300 series. The GFR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of manual, automatic or differential-pressure drain, 40 um or 5 um elements, psi, MPa or bar gauge scales, and G or NPT thread options to order. Rated flow is published as curves rather than a single figure, so ask us to confirm the datasheet and sizing for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator 1/4 in PT, 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 | 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. |
| (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. |
| 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) |
Feeds clean, finely filtered air to a machining-centre clamping circuit, holding a steady regulated pressure so workpiece clamps stay consistent through the whole cycle.
Conditions the air feeding carton-sealing and case-packing cylinders on a packaging conveyor, with the check valve holding downstream pressure if the main supply dips.
Prepares compressed air for bench-top lab and test instruments that need fine 5 um filtration and a stable, gauge-monitored pressure at the point of use.
Size 300 with a 1/4 in PT port suits lines where air demand sits in the mid range of the G-series ladder; step up to size 400 or 600, or down to size 200, as your flow requirement moves. The 5 um element here is the right pick when downstream valves, cylinders or instruments are sensitive to finer particles; the 40 um standard element is the economical choice for general shop air. Drain is differential-pressure as standard; specify automatic (A) for a positive auto-drain or manual (M) where you want drain control by hand. The square gauge is fitted here reading psi; MPa or bar scales and an external round gauge are alternatives. Thread is PT as standard, with G (BSPP) and NPT as order options, and the bracket is included. Because rated flow is published only as curves, not a single number, 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 this series as performance curves rather than a single rated figure, so we do not quote one number. Tell us your line pressure and air demand and we will confirm the datasheet curve and check the sizing for your application on request.
The W code in GFR30008F2WK selects the 5 um filter element, one grade finer than the 40 um standard, for downstream equipment that needs cleaner air. The K code fits a reverse/check valve, which holds pressure on the regulated side if the upstream supply drops. Both are decodable order options on the GFR range.
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.