The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 5um Round Gauge is a genuine G-series filter regulator: water separation, 5 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 300-size filter regulator that cleans compressed air and sets downstream pressure in a single body. This configuration carries a 1/4 in NPT port, a 5 um filter element for finer particulate and water removal than the standard 40 um grade, a differential-pressure drain that bleeds collected condensate automatically as flow passes through, and a round pressure gauge reading in psi. The regulator is the standard type with an adjustment range of 0.15-0.9 MPa (20-130 psi), and 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, and in PT, G (BSPP) or NPT thread, with 40 um or 5 um filtration, manual, automatic or differential-pressure drains, and square or round gauges in MPa, psi or bar scales. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 5um Round Gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 5 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 | Not fitted |
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. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| T | NPT thread. PT is the default; G is BSPP and T is NPT. |
| (blank) | No reverse-flow valve (the default). |
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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Installed on the 1/4 in air drop feeding a machining centre's pneumatic tool-clamp and chip-clearing circuits: the 5 um element protects the clamp cylinder and solenoid valves from fine particulate and carryover water, while the regulator holds a steady set pressure for consistent clamping force.
Mounted ahead of the pneumatic diverter gates and sealing jaws on a packaging conveyor: clean, regulated air keeps the divert cylinders and jaw actuators cycling at a consistent pressure through shift after shift, and the differential-pressure drain handles condensate on a continuously flowing line.
Used as a point-of-use conditioning station tapping off a factory air main to feed air-operated instruments, actuators and small process valves: the 5 um grade and stable regulated output suit equipment that is sensitive to dirt and pressure fluctuation, with the round psi gauge giving operators a local readout.
Choose the size and port step against the air demand of the circuit: the GFR300 with its 1/4 in NPT port sits in the middle of the range, with 200 for lighter duty and 400/600 for larger lines. This unit is specified with the 5 um element (code W) - select it when downstream valves, cylinders or instruments need finer filtration than the standard 40 um grade. The differential-pressure drain suits installations where the unit sees regular flow and you want condensate removed without manual attention; choose a manual-drain variant for intermittently used lines or an automatic drain where you want positive purging of the bowl. The round psi gauge on this code gives direct readout in US units; square embedded gauges and MPa or bar scales are alternatives. PT is the standard thread and G (BSPP) or NPT are order options - order the thread your piping uses. Bracket included on this code; a no-bracket (J) variant exists. Because flow is published as curves rather than a single rated figure, send us your application details and we will confirm sizing against the datasheet before you order.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. Without the K option, air cannot flow back through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR series as characteristic curves rather than a single rated figure, so we do not quote a l/min, m3/h or SCFM number. Tell us your inlet pressure, set pressure and air demand and we will confirm the flow from the datasheet curves for this exact model before you order.
The W in the code GFR30008C2WT selects the optional 5 um filter element instead of the 40 um standard, for finer removal of particulate and water. The drain is the differential-pressure type (no drain letter in the code): it discharges collected condensate automatically as air flows through, with no manual draining needed on regularly used lines. If your line runs only intermittently, ask us about the manual-drain (M) or automatic-drain (A) variants.
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.