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 GFR-series filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This 300-size unit is configured with 1/4 in NPT ports, a manual drain bowl in polycarbonate, the standard 40 um filter element, and the low-pressure regulator type for applications that call for reduced set pressures. A round external gauge on a psi scale is fitted, a reverse/check valve is built in to hold downstream pressure, and a mounting bracket is included.
This is a genuine AirTAC part. The GFR line spans sizes 200, 300, 400 and 600 with a choice of PT, G or NPT threads, differential-pressure, automatic or manual drains, a 5 um element option (code W), and gauge scales in MPa, psi or bar. Flow is published in the AirTAC catalogue as curves rather than a single rated figure, so we confirm the exact 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 — round, 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). |
| C | Gauge shape: Round. 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 and regulates the air to pneumatic clamp cylinders that hold workpieces at reduced set pressures, with the check valve holding the clamped line if supply dips and the 40 um element keeping spool valves clean.
Conditions the shop-air supply ahead of diverter and stopper actuators on a filling or packaging conveyor, filtering out water and scale so the low set pressures stay stable shift after shift.
Filters and regulates the air feeding air knives or blow-off nozzles in a finishing cell, where the low-pressure type suits gentle, reduced-pressure blowing and the manual drain suits a supervised utility drop.
Size the unit by the port and flow step: 200, 300, 400 and 600 correspond to increasing port sizes and flow capacity, so match the 1/4 in NPT ports here against your line size and demand. Choose the drain to suit the installation: manual drain (this unit) needs periodic operator draining, while automatic and differential-pressure drains handle condensate continuously. The 40 um element is the standard grade; specify the W option for 5 um filtration where downstream components need finer protection. Gauge scale is selectable (MPa, psi or bar), and PT is the standard thread with G and NPT available as order options. Note this is the low-pressure (L) regulator type; its exact regulation range is not published in the catalogue, so ask us to confirm it against your set pressure before ordering. Flow is published as curves, not a single rating, so have us confirm sizing against the application 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 series as characteristic curves in the catalogue, not as a single rated number, so we do not quote a figure here. Tell us your inlet pressure, set pressure and demand and we will confirm the flow from the datasheet curves for this exact model before you order.
The M in the code specifies a manual drain bowl: condensate collects in the polycarbonate bowl and an operator drains it periodically. Choose manual where the unit sits at an attended station or is checked on a maintenance round; choose the automatic or differential-pressure drain option instead where the unit runs unattended and condensate must be removed continuously.
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.