The AirTAC GFR300-08 AirTAC Filter Regulator, NPT1/4, Manual Drain is a genuine G-series filter regulator: water separation, 40 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 regulates downstream pressure in a single body. This configuration has 1/4 in NPT ports, a manual-drain polycarbonate bowl, a standard 40 um filter element, an external round pressure gauge with MPa scale, and a built-in reverse (check) valve; it is supplied without a mounting bracket. The regulator adjusts from 0.05 to 0.9 MPa (7-130 psi), the unit accepts up to 1.0 MPa (145 psi) inlet pressure, and it operates from -5 to 70 C, non-freezing.
This is a genuine AirTAC part from the GFR300 series. GFR filter regulators are available in sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 in, and with choices of drain type, 40 um or 5 um filtration, gauge style and scale, G/NPT thread options and mounting bracket. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application.
| Model | GFR300-08 AirTAC Filter Regulator, NPT1/4, Manual Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 40 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 — round, MPa 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 0.05 - 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). |
| C | Gauge shape: Round. C is round, F is square. |
| 1 | Gauge scale: MPa. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeding clean, regulated air to the film-sealing cylinders and vacuum cups on a carton wrapping machine, with the check valve holding the set pressure against backflow.
Regulating clamp-cylinder pressure at a small assembly press so parts are held consistently, with the 40 um element keeping water and debris out of the valve stack.
Supplying regulated air to the gate and stopper actuators on a sorting conveyor, with the manual-drain bowl emptied during scheduled line cleaning.
Pick the size and port step against the flow your line needs: this GFR300 unit has 1/4 in NPT ports, one step within the 200/300/400/600 size range. Drain type is a real choice - manual on this unit (which also allows the wider 0.05-0.9 MPa adjustment range), automatic, or the differential-pressure default. Filter grade is 40 um standard, with 5 um available as code W. The gauge can be the embedded square type or an external round gauge in MPa, psi or bar scales; thread can be PT (standard), G or NPT; a bracket is optional and this unit has none. Flow is published as curves, not a single rating, so ask us to confirm sizing against your application before ordering.
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.
Flow for this unit is published as curves in the AirTAC catalogue, not as a single rated number, so we do not quote a flow figure here. Tell us your application and required flow, and we will confirm the datasheet curve data and check that the GFR300 size with 1/4 in NPT ports is right before you order.
A manual drain means collected water is emptied by opening the drain valve on the bowl at intervals you schedule. If that does not suit your line, the same GFR300 body is available with an automatic drain (code A) or the differential-pressure default. Note the manual-drain version also allows the wider 0.05-0.9 MPa adjustment range, versus 0.15-0.9 MPa for the automatic and differential-pressure drain versions.
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.