The AirTAC GFR300-08 AirTAC Filter Regulator G1/4, Low-Pressure, PSI 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 is a filter regulator: it removes water and particulate from compressed air and holds downstream pressure at your set point in a single body. This GFR300-08 is built with a G1/4 (BSPP) port, a manual-drain polycarbonate bowl, a 40 um filter element and the low-pressure regulator type. It carries an embedded square gauge reading in psi, an integral reverse/check valve, is supplied without a mounting bracket, and is rated for a maximum inlet pressure of 1.0 MPa (145 psi) at -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR series spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 inch, plus options for drain type, 5 um filtration (code W), gauge scale (MPa, psi or bar) and thread (PT standard, G or NPT orderable). Flow is published as curves rather than a single rating, so ask us to confirm sizing and datasheet figures for your application.
| Model | GFR300-08 AirTAC Filter Regulator G1/4, Low-Pressure, PSI |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) 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. |
| 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. |
| (blank) | Filtering grade 40 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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeds spray guns and air-driven agitators on a finishing line, filtering water and particles from shop air while holding a gentle low set pressure for consistent atomisation.
Conditions the air feeding bench-top analysers and pneumatic sample handlers, with the psi gauge giving a direct local readout and the check valve holding the set point if supply dips.
Regulates and cleans air to pick-and-place cylinders and small actuators on a carton-packing conveyor, where the manual drain suits a line attended every shift.
Size the unit by port and expected flow: this 300-size body carries a 1/4 inch G-thread port; step up to 400 or 600 for larger ports and higher flow, or down to 200 for compact lines. The M code selects a manual drain, which needs periodic hand bleeding - choose automatic or differential-pressure drain codes where the installation is not attended daily. The 40 um element is the standard grade; add W for 5 um where finer protection matters. The L code makes this the low-pressure regulator type; the exact adjustment range is not published in the catalogue, so confirm the set-point window with us before ordering. The square gauge reads psi (MPa and bar scales are order options), and the K code fits a reverse/check valve to hold the downstream set point if supply dips. Thread here is G (BSPP); PT is the standard and NPT is orderable, and the J code omits the bracket. Because flow is published as curves, not a single rating, 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.
Flow for the GFR300 is published as curves in the AirTAC datasheet, not as a single rated figure, so we do not quote a number here. Send us your line pressure, set pressure and expected air consumption and we will confirm from the datasheet whether this 1/4 inch unit is correctly sized for your application.
The M in the code selects a manual drain: condensate collects in the polycarbonate bowl until an operator opens the drain, which suits attended lines - automatic or differential-pressure drain codes suit unattended installations. The J code omits the mounting bracket, so order a bracket version if the unit will be wall or panel mounted.
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.