The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 Low-Pressure 5um 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: filtration and pressure regulation combined in a single body, so one unit removes water and particulate from compressed air and holds a set downstream pressure. This configuration is the 300 size with a 1/4 in NPT port, a 5 um filter element (the W grade, finer than the 40 um standard), a manual drain for bleeding the bowl, the low-pressure regulator type, and an embedded square gauge reading in bar. A mounting bracket is included; no reverse (check) valve is fitted. The bowl on this 300 size is polycarbonate (only the 600 size uses aluminium alloy).
It is a genuine AirTAC part from the GFR300 series, one of four sizes (200, 300, 400, 600) with port options from 1/8 in to 1 in and PT, G or NPT threads. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. AirTAC publishes flow as curves rather than a single rating, so ask us to confirm the datasheet and sizing figures for your application before ordering.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 Low-Pressure 5um |
|---|---|
| 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. |
| (blank) | Mounting bracket included. |
| (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) |
Conditioning the air feeding a solenoid-valve manifold on an assembly line: the 5 um element keeps fine particulate out of the valves while the low-pressure regulator holds a gentle set pressure for delicate actuators.
Air prep for a carton-sealing or wrapping machine's low-pressure cylinder circuits, with the manual drain bled at shift start and the square bar gauge giving operators a quick setpoint check.
Point-of-use conditioning on a lab or test-bench air drop, where the 5 um grade and low-pressure regulation suit instruments and sample-handling actuators that must not see full shop-air pressure or coarse dirt.
Choose the size and port by the air demand of your equipment: this 300 size carries a 1/4 in NPT port, and the G-series steps through 200, 300, 400 and 600 with ports from 1/8 in to 1 in. Drain choice matters: this unit has a manual drain (code M), which needs someone to bleed the bowl, against automatic or differential-pressure drains that discharge condensate on their own. The 5 um element (code W) is the finer option over the 40 um standard - pick it where downstream valves and actuators need cleaner air. The square gauge here reads in bar; MPa and psi scales are available, and an external round gauge is optional. Thread is NPT on this unit; PT is the standard and G (BSPP) is also an order option. A bracket is included. Because AirTAC publishes flow only as curves, not a single rating, 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. 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, not as a single rated figure, so there is no one number we can honestly quote. Tell us your line pressure and the air demand of your equipment and we will confirm the flow and sizing from the datasheet on request.
This unit is code M - a manual drain, so the bowl is bled by hand. The same 300-size filter regulator can be ordered with an automatic or differential-pressure drain instead if you would rather not rely on someone draining it; ask us when ordering.
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.