The AirTAC GFR300-08 AirTAC Filter Regulator, NPT1/4, Auto 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 automatic drain and regulates 0.15 - 0.9 MPa (20 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The GFR300-08 is an AirTAC GFR300 filter regulator: filtration and pressure regulation combined in a single body for compressed air. It removes water and particulate down to 40 um and regulates downstream pressure within a 0.15-0.9 MPa (20-130 psi) adjustment range. This configuration has 1/4 in NPT ports, an automatic drain that ejects collected condensate without manual attention, a polycarbonate bowl, an embedded square gauge scaled in MPa, a reverse/check valve, and a mounting bracket. 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 family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 in, a choice of differential-pressure, automatic or manual drain, a 5 um filter grade option (code W), gauge scale options in MPa, psi or bar, and G, NPT or PT threads. Flow is published as curves rather than a single rated figure, so contact us and we will confirm the datasheet figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator, NPT1/4, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 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 | Automatic 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 0.15 - 0.9 MPa (20 - 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". |
| A | Drain: Automatic drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 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) |
Point-of-use conditioning ahead of a machining centre's solenoid valves and air bearings: the 40 um element strips water and chips of scale from the shop line while the regulator holds a steady set pressure for consistent clamping and tool-change actuation.
Feeding pneumatic cylinders on a carton-forming or case-sealing conveyor, where the automatic drain keeps condensate out of the actuators during unattended shifts and the check valve holds the downstream circuit if the main supply dips.
A filtered, regulated drop at an assembly bench: the square MPa gauge lets operators verify set pressure at a glance, and the 1/4 in NPT ports suit the typical drop-leg tubing size on medium-sized production tooling.
Size and port set the flow path: this unit is a size 300 with 1/4 in NPT ports, one step in the 200/300/400/600 range where larger sizes carry larger ports and more flow. Drain type is a real operating choice: the automatic drain on this model handles condensate removal unattended, while manual and differential-pressure drain variants are available if you prefer drain control at the bowl. The 40 um element is the standard grade; specify code W for the 5 um grade where finer particulate capture is needed. The square gauge is scaled in MPa here, with psi and bar scales orderable, and an external round gauge is optional. G and NPT threads are catalogue options alongside the PT standard, and the bracket is included on this model.
Because flow is published as curves rather than 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.
AirTAC publishes flow for the GFR300 series as curves rather than a single rated figure, so there is no one rated flow number we can quote. Tell us your line pressure, set pressure and the flow your application needs, and we will confirm the sizing from the datasheet curves on request before you order.
The A in the code GFR30008AF1TK specifies an automatic drain, which ejects collected condensate from the bowl without anyone opening it - useful on lines that run unattended. Differential-pressure drain (the default) and manual drain variants are also available in the GFR300 series if your maintenance routine prefers those.
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.