The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 Manual Drain 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 size-300 filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration has a 1/4 in NPT port, a manual drain bowl in polycarbonate, a 40 um standard filter element, an embedded square gauge scaled in MPa, and a reverse/check valve fitted. With the manual drain, the regulation range is 0.05-0.9 MPa (7-130 psi); maximum inlet pressure is 1.0 MPa (145 psi), and the operating temperature range is -5 to 70 C (non-freezing). A mounting bracket is included.
This is a genuine AirTAC part. The GFR family is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, PT as the standard thread and G or NPT as order options, a choice of differential-pressure, automatic or manual drain, a 5 um optional filter element (code W), gauge scale in MPa, psi or bar, and a low-pressure type on request. Flow is published as curves rather than a single rating, so we confirm flow and datasheet figures on request.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 Manual Drain |
|---|---|
| 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 | Standard 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, MPa 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. Standard type, regulating 0.05 - 0.9 MPa (7 - 130 psi). 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)). |
| (blank) | Standard 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. |
| 1 | Gauge scale: MPa. 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) |
Feeding clean, regulated air to the cylinder and valve manifold circuits of a carton-forming and sealing machine, with the manual drain emptied during shift checks.
Positioning a filter regulator ahead of a quarter-turn pneumatic actuator and its solenoid valves so the positioner sees stable supply pressure, with the check valve holding the set pressure on air loss.
Conditioning the air feeding clamps, tool-change cylinders and air-blast nozzles on a machining centre, where the 40 um element keeps sludge and scale out of the valves.
Start with the port step: size 300 carries 1/4 in ports, and the correct size is chosen against the flow your line needs - flow is published as curves, not a single rating, so ask us to confirm sizing against your application before ordering. For this unit the drain is manual, which suits installations where an operator drains the bowl on a routine; automatic or differential-pressure drain versions are available if you prefer unattended draining. The 40 um element is standard; specify the 5 um option (code W) if finer particulate removal is needed. Gauge scale is MPa here, with psi and bar scales available, and an external round gauge is optional. PT is the standard thread; this unit is ordered with NPT, and G (BSPP) is also a catalogue option. A mounting bracket is included.
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, not as a single rated figure, so we do not quote a number here. Tell us your line pressure and the flow your application needs, and we will confirm the correct size against the datasheet curves on request before you order.
Manual drain means an operator opens the drain at the bottom of the bowl to release collected water - there is no automatic discharge. With the manual drain the regulation range is 0.05-0.9 MPa (7-130 psi). Automatic and differential-pressure drain versions are available in the same size if you want unattended draining.
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.