The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 with 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 GFR300-08 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This size 300 unit is specified with a 1/4 in NPT port, the standard 40 um filter element, and a differential-pressure drain that bleeds collected condensate automatically whenever the pressure differential across the element is high enough - no daily manual draining on lightly loaded lines. The regulator covers 0.15-0.9 MPa (20-130 psi) of adjustment, and this configuration carries a round pressure gauge reading in bar plus a built-in reverse/check valve that holds the downstream setting if upstream supply is interrupted. The polycarbonate bowl suits this size, and a mounting bracket is included for panel or wall fixing.
This is a genuine AirTAC part from the GFR300 series, one of four sizes (200/300/400/600) with port options from 1/8 in to 1 in and thread choices of PT (standard), G (BSPP) or NPT. Drain, filter grade, gauge style and scale, and check-valve options let you match the unit to the line. We confirm flow and other datasheet figures on request, since flow is published as curves rather than a single rating.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 with Gauge |
|---|---|
| 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, 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. 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. |
| 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) |
Feeds clean, regulated air to fixture clamps and vises on a machining centre, with the check valve holding clamp pressure if the shop air main drops.
Conditions and regulates supply to diverters, pushers and sealing cylinders on a bottling or cartoning conveyor, with automatic condensate handling between shifts.
A point-of-use filter regulator for a workbench assembly cell, keeping water and swarf out of actuators and giving operators a bar-scale gauge at the station.
Size and port set the flow capacity: step up from 300 to 400 or 600 if your demand grows, or down to 200 for compact circuits - here you have 1/4 in NPT. Drain choice matters: differential-pressure (this unit) drains itself under load, automatic drains continuously, and manual suits intermittent duty where an operator can bleed the bowl. Filter grade is 40 um standard; specify 5 um (code W) only where downstream valves or instruments need finer protection. Gauge options are the embedded square type or an external round gauge, with MPa, psi or bar scales - this unit has a round bar gauge. Thread is NPT here; PT is the catalogue standard and G (BSPP) is also orderable. A mounting bracket is included.
Flow for this series is published as curves, not a single rated figure, so send us your air demand and we will confirm the correct size 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 this series as curves rather than a single rated figure, so we do not quote one number. Tell us your air demand and operating pressure and we will confirm the correct size from the datasheet on request before you order.
The differential-pressure drain (the default) releases collected condensate automatically when the pressure drop across the 40 um element rises, so the bowl empties itself under normal load. If your duty is intermittent or you prefer operator control, automatic (code A) and manual (code M) drain versions are orderable in the same size.
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.