The AirTAC GFR300-08 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 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 GFR300-08 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-prep position. This configuration carries the 5 um filter element (the finer of the two grades), a manual drain on the PC bowl that you open by hand to dump collected condensate, a built-in square pressure gauge reading in psi, and no mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi), the standard regulator adjusts from 0.05 to 0.9 MPa (7-130 psi), and the operating temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part from the GFR300 size family, one of four sizes (200 / 300 / 400 / 600) with port sizes from 1/8 in to 1 in and options including G or NPT thread, automatic or differential-pressure drain, 40 um or 5 um filtration, gauge scale, bracket and reverse/check valve. Flow is published as curves rather than a single rated figure, so send us your application and we will confirm the sizing and datasheet figures on request.
| Model | GFR300-08 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 | 0.05 - 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 | Fitted — square, 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 0.05 - 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. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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) |
Feeds filtered, regulated air to a clamping cylinder on a fixture line: the 5 um element keeps wear particles out of the valve and cylinder, and the operator sets clamp pressure on the psi gauge and vents condensate from the bowl at shift end via the manual drain.
Sits ahead of the solenoid-valve manifold on a cartoning or filling machine, delivering clean air at a set pressure to the sealing and ejector cylinders; the square psi gauge gives the technician a visible setpoint during changeover.
Mounted at the point-of-use drop feeding impact drivers and nutrunners at an assembly bench, where the regulator holds a stable tool pressure and the 5 um filtration protects the tools' air motors from water and pipe scale.
Start with the port step: this 300-size unit takes 1/4 in NPT, and the G-series steps up through 300 / 400 / 600 with larger ports and more flow capacity, so match the size to the air demand of the circuit rather than oversizing on guesswork. Because flow is published as curves and not a single rating, ask us to confirm sizing against your application before ordering. The real choices on this family are: drain type (manual, as fitted here, versus automatic or differential-pressure drain if you cannot rely on someone opening the bowl), filter grade (40 um standard versus the 5 um element on this unit for finer protection downstream), gauge scale (MPa, psi or bar), thread (PT is the standard; G and NPT are order options), and bracket. This unit has no bracket fitted - add one if the unit will be panel- or wall-mounted rather than plugged directly into a valve or manifold.
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 GFR300 as characteristic curves rather than a single rated figure, so we do not quote one number. Tell us your application and required flow, and we will confirm the sizing against the datasheet curves on request before you order.
The M in the code means the PC bowl drains by hand: you open the drain to release collected water. Choose manual where someone checks the unit routinely; choose the automatic or differential-pressure drain option if the unit is in a location that is not visited daily, so condensate is handled without operator action.
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.