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 GFR300-10MLJF2T is a filter regulator: water and particulate removal plus downstream pressure regulation combined in a single 300-size body with a 3/8 in NPT port. This configuration is the low-pressure type, suited to circuits where set pressures sit below the standard regulator band; it carries a manual drain bowl, a 40 um standard filtration element, an embedded square gauge reading in psi, and is supplied without a mounting bracket. The polycarbonate bowl lets you see accumulated condensate at a glance, and the manual drain is emptied by hand on your maintenance schedule. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR series is offered in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of PT, G or NPT thread, differential-pressure, automatic or manual drains, a 40 um standard or 5 um (code W) element, standard or low-pressure regulation, gauge scale options, and bracket or no-bracket mounting. Flow is published as curves rather than a single rating, so we confirm the exact figure for your application on request.
| 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 — square, psi 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. |
| 2 | Gauge scale: psi. 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) |
On a machining cell where workholding clamps run at reduced set pressures, this low-pressure filter regulator cleans the supply air and holds the clamp circuit pressure, with the psi gauge giving the operator a direct local reading.
Fitted at the drop to a packaging machine's actuator bank, the unit removes water and pipe scale from the shop air and regulates the supply to the cylinders, while the manual drain is emptied during scheduled line checks.
On a laboratory automation skid using air-driven valves and actuators, the filter regulator conditions the compressed air supply and sets the lower operating pressure the low-pressure type is intended for, with condensate drained manually.
Start with the port step: this unit is 3/8 in NPT in the 300 size, and moving to size 400 or 600 gives a larger port and more flow capacity if your line needs it. The manual drain here means an operator drains the bowl by hand - choose automatic (code A) or differential-pressure (blank) if the unit will sit where regular manual draining is impractical. The 40 um element is the standard grade; specify 5 um (code W) when downstream components need finer filtration. The embedded square gauge reads in psi; MPa and bar scales and an external round gauge are alternatives. PT is the standard thread and G or NPT are order options - order the variant that matches your piping. A mounting bracket is optional; this code omits it. Because flow is published as curves rather than a single rated figure, 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 GFR series as curves rather than a single rated figure, so we do not quote a number here. Tell us your application and we will confirm the flow figure from the datasheet on request before you order.
The M in the code specifies a manual drain: condensate collected in the polycarbonate bowl is released by hand, which suits positions checked on a regular maintenance round. If the unit will be hard to reach, order the automatic (code A) or differential-pressure (blank) drain variant instead.
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.