The AirTAC GFR300-08T AirTAC Filter Regulator, 1/4 in 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 GFR300-08T is a filter regulator: it removes water and particulate from compressed air and sets downstream pressure in a single body, so one 1/4 in NPT unit does both jobs in the air-preparation position. This configuration is built with the fine 5 um filter element (code W), a differential-pressure drain that bleeds collected condensate automatically as flow passes through, a round pressure gauge scaled in bar, and a reverse/check valve fitted so downstream pressure is held if the supply side drops. The polycarbonate bowl lets you see the condensate level, and the unit ships without a mounting bracket.
This is a genuine AirTAC part from the GFR300 series, one of four sizes (200, 300, 400, 600) that step up in port and flow capacity, with G (BSPP), NPT and PT thread options, a choice of differential-pressure, automatic or manual drain, 40 um or 5 um filtration, and gauge or no-gauge variants. Maximum inlet pressure is 1.0 MPa (145 psi) and the standard regulator adjusts from 0.15 to 0.9 MPa (20-130 psi). Rated flow is published as curves rather than a single figure, so ask us and we will confirm the datasheet numbers for your application.
| Model | GFR300-08T AirTAC Filter Regulator, 1/4 in 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 | 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. |
| J | Supplied without bracket. |
| (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. |
| 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeding filtered, regulated air to the tool-change and clamping circuits of a machining centre, where the 5 um element protects the directional valves and the check valve holds clamp pressure if the shop supply dips.
Conditioning the air feed to conveyor stop-gate and case-sealing cylinders on a packaging line, with the regulator set to the pressure the actuator circuit was designed for and the differential drain keeping condensate off the valves.
Supplying clean, regulated air to a laboratory autosampler or analytical-instrument pneumatic circuit, where the 5 um grade and visible PC bowl let technicians verify air quality and condensate at a glance.
Size and port are the first decision: the 300 size with its 1/4 in port suits compact supply drops, while the 200, 400 and 600 sizes step the port and flow capacity up or down - match the step to the air demand of the circuit rather than oversizing on guesswork. This unit already carries the fine 5 um element (W); the standard grade is 40 um, so choose 5 um where downstream valves, cylinders or instruments want cleaner air, and remember the finer element costs a little more pressure drop. Drain is differential-pressure here; automatic (A) and manual (M) versions exist if you prefer a self-purging or hand-drained bowl. The gauge fitted is the external round type scaled in bar; embedded square gauges and MPa or psi scales are the other catalogue options. Thread is NPT on this code - PT is the standard and G (BSPP) is also orderable - and the J suffix means no mounting bracket, so plan a bracketed variant (blank) if you want panel fixing. Because rated flow is published as curves and not a single rating, 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR300 series as performance curves rather than a single rated figure, so we do not quote one number here. Send us your line pressure, downstream demand and acceptable pressure drop, and we will confirm the datasheet curve figures and check the sizing for you before you order.
W is the filter-grade code: this GFR300-08T carries the fine 5 um element instead of the standard 40 um one. Both remove water and particulate, but 5 um gives cleaner air for sensitive valves, cylinders and instruments, at the cost of a slightly higher pressure drop across the element. The 40 um version is the same unit without the W.
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.