The AirTAC GFR300-08 AirTAC Filter Regulator G1/4, 5 um, Auto Drain 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 regulates downstream pressure in one body. This configuration is the 300 size with a G1/4 (1/4 in) port, a 5 um filter element (the finer of the two published grades), an automatic drain that expels collected condensate without manual attention, and a low-pressure regulator type for circuits that run below standard working pressures. It is fitted with an embedded square gauge scaled in psi and a reverse/check valve, and it is supplied without a mounting bracket.
This is a genuine AirTAC part. The GFR family is published in 200, 300, 400 and 600 sizes with port sizes from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drain, 40 um or 5 um filtration, and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application before ordering.
| Model | GFR300-08 AirTAC Filter Regulator G1/4, 5 um, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Low-pressure 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 — 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. The low-pressure type adjusts over a lower band than standard; we confirm the exact figures from the factory datasheet. 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)). |
| L | Low-pressure 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. |
| 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. |
| G | G (BSPP) 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 and regulates air to a light-duty pneumatic press where the operator needs a lower regulated pressure than a standard regulator delivers, with the 5 um element protecting the press valve from particulate and the automatic drain handling condensate in an unattended cell.
Mounted ahead of a valve manifold on a carton-sealing or wrapping machine, it cleans the supply to 5 um, holds the low working pressure the valve island is specified for, and the check valve holds the setting against momentary supply dips.
Supplies filtered, low-pressure air to pilot-plant instruments and pneumatic actuators on a process skid, where the 5 um grade keeps sensitive components clean and the psi-scaled square gauge gives operators a direct local reading.
Start with the port step: the GFR range runs 200/300/400/600 across 1/8 in to 1 in, so match the size to the air demand of the circuit rather than only the existing pipework. This unit is already specified with the 5 um element - choose it where downstream valves, cylinders or instruments need finer filtration than the 40 um standard; stay with 40 um where general plant air is acceptable. Drain choice matters: automatic drain (this unit) suits points that are hard to reach or run unattended, manual drain suits accessible, regularly serviced positions, and differential-pressure drain is the catalogue default. The embedded square gauge is standard and this one is scaled in psi; MPa or bar scales and an external round gauge are alternatives. Thread is G here - PT is the standard offering and NPT is also an order option - and brackets are optional (this unit has none).
Flow for this family is published as curves, not a single rated number, so we cannot quote one honestly. Send us your application's air demand and we will confirm sizing against the datasheet 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 family as curves, not as a single rated figure, so we do not quote a number that is not in the datasheet. Tell us your application's air demand and operating pressure and we will confirm the correct size against the datasheet on request before you order.
The A in the code GFR30008ALJF2WGK is the automatic drain: it discharges collected condensate by itself, which suits positions that are not checked daily. The W is the 5 um filter element, the finer published grade, chosen over the 40 um standard when downstream valves, cylinders or instruments need cleaner air. The L marks the low-pressure regulator type and K the fitted reverse/check valve.
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.