The AirTAC GFR300-08C3WT AirTAC Filter Regulator 1/4 NPT 5 um 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 GFR300-08C3WT is a 300-size filter regulator that removes water and particulate from compressed air and holds downstream pressure in a single body. This configuration is threaded 1/4 in NPT, carries the fine 5 um filter element (code W), drains condensate automatically by differential pressure as flow varies, and is fitted with an external round pressure gauge reading in bar. The polycarbonate bowl lets you see accumulated condensate at a glance, and the unit is supplied with a mounting bracket for secure panel or wall fixing.
This is a genuine AirTAC part from the GFR300 series, one of four sizes (200, 300, 400, 600) spanning the port range from 1/8 in to 1 in, with manual or automatic drain options, 40 um or 5 um filtration, and MPa, psi or bar gauge scales to order. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Flow figures for this series are published as curves rather than a single rating, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR300-08C3WT AirTAC Filter Regulator 1/4 NPT 5 um |
|---|---|
| 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, bar 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. |
| 3 | Gauge scale: bar. 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 at the drop to a machining centre's pneumatic circuit, the 5 um element protects solenoid valves and cylinders from water and fine particulate while the regulator holds a steady set pressure for clamping and tool-change actuation.
Mounted at the inlet of a packaging machine's air preparation stack, this filter regulator conditions the supply for sealing jaws and diverters, with the bar gauge giving operators a visible setpoint check during changeover.
Fitted at the point of use on a factory assembly bench, the unit delivers clean, regulated air to hand-held pneumatic tools and fixtures, with the bracket-mounted body keeping the gauge and bowl in the operator's line of sight.
Choose the size and port step against the air demand of the circuit: the GFR300 with its 1/4 in NPT ports sits in the middle of the G-series range, with 200, 400 and 600 sizes available when a smaller or larger connection is needed. This unit pairs the fine 5 um element (W code) with differential-pressure draining, which suits lines with steady flow; if air use is intermittent or very low, a manual-drain or automatic-drain variant may drain more reliably. The fitted round gauge reads in bar; MPa and psi scales and the embedded square gauge are the alternative gauge choices. NPT is the thread on this code, with G (BSPP) and PT available as order options, and the mounting bracket is included.
Because flow for the GFR series is published as curves and not as a single rated figure, we do not quote a flow number here. Send us your application details and we will confirm the correct size against the datasheet curves 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 performance curves rather than a single rated figure, so we do not quote a flow number here. Tell us your application's air demand and line pressure, and we will confirm the sizing against the datasheet curves on request before you order.
The W in the code GFR30008C3WT selects the optional fine 5 um filtration grade, which suits circuits with sensitive valves or instruments. The standard grade for the GFR300 series is 40 um, so if your line does not need fine filtration, the same filter regulator is available with the 40 um element by ordering the version without the W code.
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.