The AirTAC GFR300-08 AirTAC Filter Regulator, NPT1/4, 5 um Filter 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 automatic 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 compact body. This configuration is the 300 size with a 1/4 in NPT port, fitted with the 5 um filter element (code W) for finer filtration than the standard 40 um grade, an automatic drain that expels collected condensate without manual attention, and the standard regulator with an adjustment range of 0.15-0.9 MPa (20-130 psi). No gauge is fitted (code N) and no mounting bracket is included (code J). The polycarbonate bowl suits the 300 size, and the maximum working (inlet) pressure is 1.0 MPa (145 psi) with an operating temperature of -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR filter-regulator family spans sizes 200, 300, 400 and 600, with port options from 1/8 in to 1 in, PT (standard), G or NPT threads, differential-pressure, automatic or manual drains, 40 um or 5 um filtration, gauge choices, and low-pressure variants. Flow figures for this series are published as curves rather than a single rated number, so contact us and we will confirm the datasheet figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator, NPT1/4, 5 um Filter |
|---|---|
| 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Not fitted |
| 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". |
| A | Drain: Automatic 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. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 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) |
Feeding a bench-mounted pneumatic press on a fabrication line: the 5 um element protects the valve stack and cylinder seals from particulate, the automatic drain clears condensate between shifts, and the regulator holds the working pressure the press tooling was set up for.
Supplying air to carton-closing and case-erector cylinders on a packaging conveyor: the filter-regulator combination conditions the supply and sets a stable pressure for consistent actuator stroke, with the automatic drain handling moisture from the plant ring main.
Conditioning air for vacuum ejectors and gripper cylinders on a robotic handling cell: the 5 um grade suits the fine internal passages of ejector fittings, the 1/4 in NPT port matches typical cell drop lines, and regulation keeps gripper force repeatable.
Choose the size and port step against the air consumption of the circuit: this unit is the 300 size with a 1/4 in NPT port, one step up from the 200 size. Drain type is a real choice: automatic (fitted here) suits unattended duty, manual suits periodic checks, and differential-pressure drain is the catalogue default. Filtration grade is 40 um standard or 5 um (code W, fitted here) where finer particle removal is needed downstream. Gauge and scale (square embedded or round external, MPa/psi/bar scales) can be ordered where no gauge code is specified - this unit carries code N, so no gauge is fitted. Thread is PT as the standard, with G and NPT as order options; this unit is NPT. Bracket inclusion is optional (code J means no bracket).
Flow for the GFR series is published as curves, not as a single rated figure, so we do not quote a rated flow number. Ask us to confirm sizing against your application from the datasheet before ordering.
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 curves rather than a single rated figure, so we do not state a rated flow, Cv or SCFM number. Send us your application details and we will confirm the relevant datasheet figures on request before you order.
The code A in GFR30008AJNWT specifies an automatic drain, which expels collected condensate on its own instead of requiring manual draining. The code N specifies that no pressure gauge is fitted; a gauge (square embedded or round external, with MPa, psi or bar scales) is available as an order option if you want visual pressure indication.
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.