The AirTAC GFR300-10 AirTAC Filter Regulator NPT 3/8 in Low-Pressure 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 PT3/8" 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 GFR300-10 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 3/8 in NPT port, manual drain, 40 um standard filter element, low-pressure regulator type, a round pressure gauge with MPa scale, and a built-in reverse (check) valve; no mounting bracket is included.
This is a genuine AirTAC part. The GFR series covers 200, 300, 400 and 600 sizes with ports from 1/8 to 1 in, a choice of manual, automatic or differential-pressure drains, 40 um or 5 um (W) filtration, gauge styles and MPa/psi/bar scales, G (BSPP) or NPT thread options, and bracket or no-bracket mounting. 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 sizing figures from the datasheet for your application.
| Model | GFR300-10 AirTAC Filter Regulator NPT 3/8 in Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 40 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, 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. 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. |
|---|---|
| 10 | Port size PT3/8". 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). |
| 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 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Filtered, low-pressure regulated air to spray guns and air-assisted applicators, with the manual drain cleared at shift checks to keep moisture out of the finish.
Low-pressure air to carton-sealing and wrapping actuators on a packaging conveyor, with the 40 um element protecting seals and valves from water and debris.
Reduced-pressure air to bench instruments and test rigs, with the MPa gauge giving a clear local setpoint and the check valve holding the downstream circuit.
Size and port set the flow capacity: the 300 size with a 3/8 in NPT port suits lines whose air demand sits within the GFR300 flow curve - we can check the curve against your consumption before you order. This unit is the low-pressure regulator type, so choose it where the downstream setpoint sits well below standard ranges; we will confirm the exact adjustment range for this variant on request. The manual drain (code M) needs periodic draining by hand - pick the automatic or differential-pressure drain code if you want unattended draining. Filtration is the 40 um standard element; specify W for 5 um where finer protection is needed. The round gauge here reads in MPa; psi and bar scales are available. Thread is NPT; PT (the standard) and G (BSPP) are order options. No mounting bracket is included (code J).
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.
AirTAC publishes flow for the GFR series as curves, not a single rated figure, so we do not quote a number here. Send us your air consumption and line pressure and we will confirm from the datasheet whether the 300 size at 3/8 in NPT suits your application.
Code M is the manual drain: condensate collects in the PC bowl and you open the drain by hand as part of routine checks; automatic (A) and differential-pressure (blank) drains are available if you prefer unattended operation. The L code makes this the low-pressure regulator variant, intended for setpoints below the standard range - we confirm its exact adjustment range on request.
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.