The AirTAC GFR300-10 AirTAC Filter Regulator NPT 3/8 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 GFR300-10MLJF3T is an AirTAC GFR300 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration carries a 3/8 in NPT port, a manual drain, the standard 40 um filter element, and the low-pressure regulator type. A square gauge with a bar scale is fitted, the unit is supplied without a mounting bracket, and no reverse/check valve is fitted. Maximum working (inlet) pressure is 1.0 MPa (145 psi), with an operating temperature of -5 to 70 C, non-freezing.
This is a genuine AirTAC part from the GFR series, which spans sizes 200 to 600 with ports from 1/8 in to 1 in, a choice of manual, automatic or differential-pressure drains, 40 um or 5 um (W) filtration, PT, G or NPT thread options, and gauge scale choices. AirTAC publishes flow for this series as performance curves rather than a single rating, so ask us to confirm figures from the datasheet for your application.
| Model | GFR300-10 AirTAC Filter Regulator NPT 3/8 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 — 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. |
|---|---|
| 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). |
| F | Gauge shape: Square. C is round, F is square. |
| 3 | Gauge scale: bar. 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. |
| (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 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Filtered, regulated air at reduced pressure holds pneumatic clamps along a furniture production line; the manual drain lets an operator clear collected water at the start of each shift.
40 um filtration plus low-pressure regulation feeds a spray nozzle in a coating booth, with the fitted square bar gauge giving a direct readout of the set pressure.
The GFR300-10 regulates air to light-duty hold-down and guide cylinders along a packaging conveyor, filtering water and scale out of the line before it reaches the directional valves.
Choose the size by the port and flow step: size 300 sits mid-range in the series, with sizes 200, 400 and 600 available for smaller or larger air demand - confirm the exact flow against the published curves before ordering. Drain type is a real choice on this family: manual (this unit) suits installations that are checked regularly, while automatic and differential-pressure drains suit unattended duty. Filter grade is 40 um standard; specify the W option for 5 um where finer protection is needed. Gauge scale (MPa, psi or bar - bar is fitted here), PT vs G vs NPT thread, and the mounting bracket (omitted on this unit) are all order options. Because flow is published 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 this series as performance curves rather than a single rated figure, so we do not quote a number here. Send us your inlet pressure, set pressure and expected air demand, and we will confirm sizing against the datasheet before you order.
The M in GFR300-10MLJF3T specifies a manual drain: collected water is released by opening the drain valve by hand. Differential-pressure and automatic drains are catalogue options on the GFR300 series if you would rather not rely on manual draining, and we can quote the equivalent code.
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.