The AirTAC GFR300-08T AirTAC Filter Regulator, NPT 1/4 in, 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 manual drain and regulates 0.05 - 0.9 MPa (7 - 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: filtration and pressure regulation combined in one body, so water and particulate are removed from the compressed air and the downstream pressure is set with a single unit. This configuration has a 1/4 in NPT port, a manual drain bowl in polycarbonate, and the fine 5 um filter element (code W) instead of the standard 40 um. The regulator is the standard type with an adjustment range of 0.05-0.9 MPa (7-130 psi) on this manual-drain version, and maximum inlet pressure is 1.0 MPa (145 psi). No gauge is fitted with this code (N) and no mounting bracket is included (J); operating temperature is -5 to 70 C, non-freezing.
This is a genuine AirTAC part from the GFR300 series. The GFR family is available in sizes 200, 300, 400 and 600, with port options, a choice of manual, automatic or differential-pressure drain, 40 um or 5 um filtration, gauge and bracket options, and PT, G or NPT threads. Because rated flow is published as curves rather than a single figure, we confirm the datasheet and sizing figures for your application on request.
| Model | GFR300-08T AirTAC Filter Regulator, NPT 1/4 in, 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual 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 0.05 - 0.9 MPa (7 - 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 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 clamps and vises on a CNC cell: the 5 um element protects the clamping valves from fine particulate and condensate, while the regulator holds a steady clamp pressure at the fixture.
A point-of-use filter regulator on a cartoning or wrapping machine, giving the sealing and forming cylinders clean air and a set working pressure, with the manual drain bled at shift checks.
Conditioning the air feeding positioners, actuators and small control circuits on a process skid, where the 5 um grade and a stable regulated pressure keep sensitive components working cleanly.
Start with the port size: this unit steps 1/4 in NPT; if your line needs more air, the GFR400 or GFR600 sizes step up in port and capacity. You have already chosen the manual drain, which suits points of use where an operator can bleed the bowl regularly; automatic or differential-pressure drains suit unattended installations. The 5 um element (W) is the right pick where finer particulate matters; the standard element is 40 um. A gauge can be added at order time (square embedded or external round, in MPa, psi or bar scales), and the thread can be ordered as PT (standard), G (BSPP) or NPT. A bracket (J omits it) is optional for panel or wall fixing.
Before ordering, ask us to confirm sizing: flow is published as curves, not a single rated figure, so we will check the datasheet against your air demand and drop requirements.
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, not as a single rated figure, so we do not quote a number here. Tell us your air demand and acceptable pressure drop and we will confirm the datasheet figures and check the sizing for your application on request.
The manual drain means an operator opens the bowl drain to release collected condensate, which suits attended points of use; automatic and differential-pressure drains are available if the unit cannot be bled regularly. Filtration on this code is the fine 5 um element (the standard element is 40 um), removing water and particulate from the compressed air. Note that no gauge is fitted with this code and no bracket is included.
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.