The AirTAC GFR300-08 AirTAC Filter Regulator, NPT1/4, Low-Pressure is a genuine G-series filter regulator: water separation, 40 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT1/4" ports, a manual drain and regulates 0.05 - 0.9 MPa (7 - 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 lets you set a stable downstream pressure in one compact body. This size 300 unit has 1/4 in NPT ports, a manual drain bowl in polycarbonate, a 40 um standard filter element, and a low-pressure regulator type. A square pressure gauge reading in psi is fitted, a reverse/check valve is built in, and a mounting bracket is included.
This is a genuine AirTAC part. The GFR family runs from size 200 to 600 with port sizes from 1/8 to 1 in, and options include automatic or manual drains, a 5 um element (code W), alternate gauge scales in MPa or bar, and G (BSPP) or NPT threads in place of the PT standard. Rated flow is published as curves rather than a single figure, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator, NPT1/4, Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 130 psi)). |
| L | Low-pressure 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. |
| (blank) | Filtering grade 40 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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeds a bench-mounted pneumatic clamping press: the 40 um element keeps machining mist and pipe scale out of the cylinder seals, while the low-pressure regulator holds a gentle, repeatable clamp force set on the psi gauge.
Supplies the air cylinders that kick bottles between conveyor lanes on a filling line. The check valve keeps the diverter setting stable if upstream supply dips, and the manual drain lets the shift operator bleed accumulated water at start-up.
Conditions the supply to air-assisted spray guns in a finishing booth: water and grit are stripped before the gun, and the operator dials in atomising pressure on the square psi gauge without overdriving the low-pressure range.
Start with the port step: this unit is size 300 with 1/4 in NPT ports; larger sizes (400, 600) carry bigger ports and more flow capacity, so step up if your line demand is high. Drain choice matters: this configuration uses a manual drain, meaning someone opens the bowl drain periodically; choose automatic drain if the unit sits where regular bleeding is impractical. The 40 um element is the standard grade; specify 5 um (code W) only where finer particulate removal is needed. The fitted square gauge reads in psi; MPa or bar scales are orderable. PT is the standard thread, with G (BSPP) and NPT as order options - this unit is ordered with NPT. A bracket is included, and the built-in check valve holds downstream settings if upstream pressure is lost. Because flow is published as curves and not a single rating, send us your application details 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 G-series flow as performance curves rather than a single rated figure, so we do not quote one number. Send us your application details and we will confirm the datasheet flow curve and sizing for the GFR300-08 on request.
This configuration is ordered with a manual drain: the bowl collects separated water and an operator opens the drain periodically. If the unit will sit where regular bleeding is impractical, order the same GFR300 size with the automatic-drain code instead - both are catalogue options, and the regulator range differs by drain type, so we will confirm the exact figures for your chosen version on request.
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.