The AirTAC GFR300-08 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 GFR300-08 is an AirTAC GFR-series filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This 300-size unit has NPT 1/4 in ports, the 5 um filter element (code W, tighter than the 40 um standard), a manual drain so condensate is released by hand, and the low-pressure regulator type. An embedded square gauge scaled in bar is fitted, and no mounting bracket is included.
This is a genuine AirTAC part. The GFR series spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, and catalogue options including automatic or differential-pressure drains, 40 um or 5 um elements, G (BSPP) or NPT threads in place of the PT standard, brackets, and external round gauges with MPa, psi or bar scales. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Flow is published as curves rather than a single rating, so ask us to confirm figures and the datasheet on request.
| Model | GFR300-08 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 | 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 — square, 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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) |
Feeding pick-and-place grippers on an assembly cell: the 5 um element keeps water and debris out of the gripper valves, while the low-pressure regulator holds a gentle clamping pressure suited to delicate parts.
Supplying directional valves and cylinders on a carton-sealing conveyor: filtered, regulated air protects the valves, and the manual drain suits a line with scheduled shift checks.
Feeding spray guns in a paint booth: the low-pressure regulator type matches coating-gun supply needs, and 5 um filtration helps keep the finish free of water and particulate.
Size the unit by port and expected flow: the 300 size with 1/4 in NPT ports sits in the middle of the GFR range (200 through 600, 1/8 in to 1 in), and stepping up a size buys more flow capacity - we can check the flow curve against your demand before you order. This configuration carries the 5 um element instead of the 40 um standard, a manual drain, the low-pressure regulator type, a square gauge scaled in bar, and no bracket. The exact regulation range of the low-pressure type is not published, so confirm it with us if your setpoint is critical. On threads, PT is the AirTAC standard and G (BSPP) and NPT are catalogue options - this unit is ordered with NPT. If you prefer unattended condensate removal, the automatic (A) and differential-pressure (blank) drain variants are available in the same size.
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 series as curves rather than a single rated figure, so we do not quote a number here. Ask us to confirm the flow curve and sizing against your application before ordering - we will send the datasheet on request.
The M in GFR30008MLJF3WT specifies a manual drain: condensate is released by hand, which suits attended installations with scheduled checks. Automatic (A) and differential-pressure (blank) drains are catalogue options on the GFR300 if you prefer unattended draining, and the 5 um element on this unit can likewise be swapped for the 40 um standard in other codes.
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.