The AirTAC GFR300-08 AirTAC Filter Regulator NPT 1/4 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 regulates downstream pressure in a single body. This size 300 unit has NPT 1/4 ports, a manual-drain polycarbonate bowl, a 40 um filter element, and the low-pressure regulator type for circuits that run below standard line pressure. A square pressure gauge scaled in bar is fitted, a reverse (check) valve is built in, and no mounting bracket is supplied. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR series spans sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, and options include automatic or differential-pressure drains, a 5 um element (code W), gauge scales in MPa or psi, an external round gauge, G (BSPP) threads, and a mounting bracket. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet and sizing figures for your application.
| Model | GFR300-08 AirTAC Filter Regulator NPT 1/4 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, bar 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. |
| 3 | Gauge scale: bar. 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) |
Filtering and regulating the air feeding carton-sealing cylinders and bagging heads on a packaging machine. The 40 um element strips water and pipe scale before the valves, and the manual drain is emptied at shift start as part of the line checkover.
Supplying filtered, reduced-pressure air to clamp cylinders on a small pneumatic press that runs its clamping circuit below standard line pressure, suiting the low-pressure regulator type. The built-in check valve sits in the supply path, and the bar-scale gauge gives the operator a direct pressure readout at the machine.
Conditioning the air feed to paint spray guns in a finishing booth, where clean, steady low-pressure air matters for finish quality. The 40 um element removes water and particulate ahead of the gun, and the manual drain is bled off between batches.
Choose the size and port against the air demand of the circuit: this unit is size 300 with 1/4 in NPT ports, and larger sizes in the series carry larger ports and more flow. Drain type is a real choice: this configuration uses a manual drain, which needs someone to open the bowl drain periodically; automatic and differential-pressure drains are available if the unit cannot be serviced on a schedule. Filter grade is the 40 um standard here, with a 5 um element (code W) where finer filtration is required. The fitted square gauge reads in bar; MPa or psi scales and an external round gauge are options. Thread is NPT on this unit - PT is the standard and G (BSPP) is also a catalogue option - and a bracket can be ordered. Flow is published as curves, not a single rating, so send us your flow and pressure requirements 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 series as curves rather than a single rated figure, so we do not quote a number here. Tell us your working pressure and air demand and we will confirm the flow from the datasheet for this size 300, 1/4 in unit before you order.
A manual drain means the bowl is emptied by opening its drain fitting, which suits stations that are visited regularly. If this unit will be hard to reach, the same GFR300-08 configuration can be ordered with an automatic or differential-pressure drain instead. The bowl on this size 300 unit is polycarbonate.
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.