The AirTAC GFR300-08G AirTAC Filter Regulator, G1/4, psi Gauge 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 GFR300-08G 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 a G1/4 (BSPP) port, a 40 um standard filter element, and a differential-pressure drain that bleeds collected condensate automatically whenever the pressure drop across the element rises. The fitted round gauge reads in psi, and a reverse/check valve is built in to hold downstream pressure if the supply is lost.
This is a genuine AirTAC part from the GFR range, which spans sizes 200, 300, 400 and 600 with port options from 1/8 to 1 inch, PT/G/NPT threads, 40 um or 5 um (W) filtration, automatic, manual or differential-pressure drains, and MPa, psi or bar gauge scales. Flow is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR300-08G AirTAC Filter Regulator, G1/4, psi Gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) 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, 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. 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. |
| 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. |
| G | G (BSPP) 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) |
Clean, regulated air feeding tool changers, clamps and pneumatic actuators on a machining centre, with the check valve holding set pressure during supply dips.
Filtered and regulated air for pick-and-place and sealing cylinders on a packaging conveyor, with the psi gauge giving operators a readable setpoint.
A point-of-use filter regulator at a factory air drop, conditioning the supply before it reaches valves and air tools on the shop floor.
Size 300 with a G1/4 port suits lines running at moderate air consumption; step up to size 400 or 600 for higher flow, or down to size 200 for compact circuits. The 40 um element is the standard choice for general plant air; specify the W variant only if your application needs 5 um finishing. Drain choice matters: differential-pressure (this unit) drains on pressure drop, automatic drains on a timer-free cycle, and manual requires someone to open the bowl. This unit's round gauge reads in psi; embedded square gauges with MPa, psi or bar scales are also available in the range. Threads come as PT (standard), G or NPT to order, and a mounting bracket is included.
Because flow is published only as curves and not as a single rated number, please ask us to confirm sizing against your actual air demand before ordering - we will pull the datasheet figures for you.
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 rated flow number. Tell us your application and required air consumption, and we will confirm the relevant datasheet figures on request before you order.
K means a reverse/check valve is fitted, so downstream pressure is held if the upstream supply drops. This unit has a differential-pressure drain: condensate is expelled automatically when the pressure drop across the 40 um element rises, with no manual draining needed. Automatic (A) and manual (M) drain versions are also available in the range.
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.