The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 Round Gauge MPa 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 differential-pressure 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 AirTAC GFR300 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single compact body. This configuration is the 300 size with a 1/4 in NPT port, standard 40 um filtration, and a differential-pressure drain that automatically bleeds accumulated condensate whenever the pressure differential across the element is sufficient - no daily manual draining required. A round pressure gauge on the MPa scale is fitted, and a reverse/check valve is installed so downstream pressure is held if the upstream supply is lost.
This is a genuine AirTAC part. The GFR series is available in sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, and with manual or automatic drain, 5 um filtration (code W), square or round gauges on MPa, psi or bar scales, and G or NPT threads as order options. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Flow is published as curves rather than a single rating, so we confirm flow and datasheet figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 Round Gauge MPa |
|---|---|
| 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 | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, 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". |
| (blank) | Drain: Differential-pressure 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). |
| C | Gauge shape: Round. 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) |
Installed at the drop feeding a pneumatic press station, the GFR300-08 cleans the supply air of water and debris and holds a stable, reduced working pressure so the press cylinder cycles consistently regardless of header fluctuations.
Mounted at the take-off for conveyor diverters, stoppers and gate cylinders, this unit filters condensate and particulate out of the 1/4 in branch line and regulates it to the pressure the actuators were designed for, with the check valve holding position if supply air is interrupted.
Fitted inside a machine's air preparation panel, the unit provides one filtered, regulated supply point for the machine's valves and cylinders, with the MPa gauge giving the operator a direct reading of set pressure and the bracket allowing clean panel mounting.
Size and port: the 300 size with a 1/4 in NPT port suits lines where the required flow falls in the mid range of the G-series span; step up to 400 or 600 for larger ports and higher flow, or down to 200 for compact circuits. Drain type: this unit uses the differential-pressure drain (the default); choose automatic drain (code A) for unattended condensate removal or manual drain (code M) where you want controlled discharge. Filter grade: 40 um is standard for general air preparation; specify 5 um (code W) where downstream components need finer protection.
Gauge: a round gauge on the MPa scale is fitted here; square embedded gauges and psi or bar scales are alternatives. Thread: this unit is ordered with NPT; PT is the standard thread and G (BSPP) is also a catalogue option - all are specifications to order, not delivery statements. A reverse/check valve (code K) is fitted, and the mounting bracket is included. Regulation range is 0.15-0.9 MPa (20-130 psi) with this differential-pressure drain. 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 GFR series as curves, not as a single rated figure, so we do not quote a number here. Tell us your application's flow and pressure requirements and we will confirm the sizing from the datasheet curves on request before you order.
This unit's differential-pressure drain discharges accumulated condensate automatically whenever the pressure differential across the filter element is high enough - it is the default and needs no daily attention. If you prefer controlled discharge, order the manual drain (code M); for fully unattended condensate removal, the automatic drain (code A) is the alternative. All drain options keep the same 0.15-0.9 MPa (20-130 psi) regulation range except that the manual-drain version widens the lower end to 0.05 MPa (7 psi).
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.