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 regulates downstream pressure in a single body. This configuration is the 300 size with a 1/4 in NPT port, low-pressure regulation type, a 5 um filter element (code W), a manual drain and a round pressure gauge with bar scale. The polycarbonate bowl suits the 300 frame, the mounting bracket is included, and the unit is rated for a maximum inlet pressure of 1.0 MPa (145 psi) at -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family spans the 200, 300, 400 and 600 sizes with ports from 1/8 to 1 in, and options for thread (PT standard; G and NPT to order), drain type, 40 um standard or 5 um fine filtration, gauge style and scale, and bracket choice. Flow for this family is published as curves rather than a single rating, so ask us to confirm sizing and any datasheet figure for your application 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 | Low-pressure 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, bar 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. The low-pressure type adjusts over a lower band than standard; we confirm the exact figures from the factory datasheet. 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)). |
| L | Low-pressure type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (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. |
| (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) |
On a spray booth or finishing line, the low-pressure type lets the operator set reduced atomizing pressure for spray guns, while the 5 um element keeps water carryover and grit out of the finish. The manual drain is bled at the end of each shift and the bar gauge gives a direct reading for repeat setups.
Packaging lines running low-pressure clamp and fold cylinders get filtration and regulation in one body, saving a slot on the machine's air preparation plate. The 1/4 in NPT port drops straight into the machine's supply take-off and the included bracket fixes the unit to the frame.
Benchtop instruments and test rigs fed at reduced pressure use this unit to clean the shop air supply and hold a gentle, repeatable setting. The 5 um grade protects sensitive pneumatic components, and the round bar-scale gauge makes the setpoint easy to log and reproduce.
The real choices on this family: step between sizes 200/300/400/600 to match the port and the flow demand of the line; pick the drain - differential-pressure (default), automatic, or manual as fitted here, which suits points where an operator can bleed collected water on a schedule; choose 40 um standard or 5 um fine filtration (this unit is 5 um); select the gauge - embedded square as standard, external round optional - and its scale in MPa, psi or bar (this unit carries a round gauge with bar scale); and order the thread as PT (standard), G or NPT. A bracket is included on this unit. Flow is published as curves, not a single rated figure, so send us your application details and we will confirm sizing from the datasheet before you order.
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. Send us your application details - port size, downstream demand and line pressure - and we will confirm the sizing from the datasheet on request.
The M in the code means the bowl drain is opened by hand to discharge collected water and contaminant. It suits mounting points an operator passes regularly, such as a machine's air preparation plate. If the unit sits where routine draining is impractical, the same family is available with automatic or differential-pressure drains instead - just ask and we will decode the alternative part number for you.
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.