The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 Low-Pressure 5um 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 is a filter regulator: it removes water and particulate from compressed air and sets downstream pressure in one compact body. This configuration is the 300 size with a 1/4 in NPT port, a 5 um filter element (code W) for finer filtration than the standard 40 um, an automatic drain that ejects collected condensate without manual attention, and the low-pressure type regulator for applications that run below standard line pressure. The embedded square gauge reads outlet pressure in MPa, the polycarbonate bowl lets you see the condensate level, and no mounting bracket is fitted.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drains, 40 um or 5 um elements, standard or low-pressure regulation, MPa/psi/bar gauge scales, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm the figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 Low-Pressure 5um |
|---|---|
| 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 | 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, MPa 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. 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. |
| 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. |
| (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) |
Bench services feeding analytical instruments and pneumatic test rigs need clean, moisture-free air held at a gentle, stable pressure. The 5 um element and low-pressure regulation of this unit suit that job, and the automatic drain keeps the bowl clear without daily attention.
Air-jet looms and spinning auxiliaries run on low-pressure air where even a 40 um particle can mark the yarn. This filter regulator conditions the supply line at the machine, with the square MPa gauge giving the operator a direct pressure readout.
Pilot-operated process valves and damper actuators often need a controlled supply well below main line pressure. Mounted at the panel, this unit filters the pilot air at 5 um and regulates it to the setpoint, with automatic condensate draining between maintenance rounds.
Start with the size and port: step up from 200 through 300, 400 and 600 as your port size and air demand grow - this unit is the 300 size with a 1/4 in NPT port. Choose the drain to suit access: automatic (as here) suits enclosed or infrequently attended installations, manual suits periodic checks, and differential-pressure draining is the catalogue default. Pick the 5 um element (code W) where finer dirt and water removal matters, or stay with the 40 um standard for general protection. Select the gauge scale (MPa, psi or bar) and thread (PT standard, with G and NPT as order options), and add a bracket if you want panel fixing - this unit ships without one.
One honest note on sizing: AirTAC publishes flow for this family as curves, not as a single rated figure, so we cannot quote you a rated flow number. Send us your application details and we will confirm the sizing against the datasheet before you order.
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 family as performance curves rather than a single rated figure, so there is no one rated flow number we can quote. Tell us your port size, line pressure and air demand, and we will confirm the sizing from the datasheet on request before you order.
The L in the code marks the low-pressure regulator type, intended for circuits that run below standard line pressure; the exact adjustment range for this variant is not published, so we confirm it on request. Choose it when your process needs gentler, controlled outlet pressure than the standard GFR type is set up for - the rest of the decode (5 um element, automatic drain, square MPa gauge, NPT1/4 port) stays the same.
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.