The AirTAC GFR300-10 AirTAC Filter Regulator NPT3/8 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 differential-pressure drain and regulates 0.15 - 0.9 MPa (20 - 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 300-size unit is configured with a 3/8 in NPT port, the low-pressure regulator type, a differential-pressure drain on the PC bowl, 40 um standard filtration, an embedded square gauge reading in psi, and a reverse (check) valve fitted. No mounting bracket is included with this configuration.
This is a genuine AirTAC part. The GFR series spans sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, a choice of drain types, 40 um or 5 um filtration, gauge scale options, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm the sizing figures for your application on request.
| Model | GFR300-10 AirTAC Filter Regulator NPT3/8 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 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 | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, psi 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". |
| (blank) | Drain: Differential-pressure drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 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. |
| 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) |
Fixture clamps and hold-down cylinders that work at reduced line pressure get both clean air and a stable, low setpoint from this filter regulator, with the check valve holding the circuit if upstream supply dips.
On a packaging line, this 300-size unit conditions the air feeding cylinders and actuators, the differential-pressure drain keeping moisture out of the bowl without daily manual attention.
Spray guns and coating heads need air filtered to 40 um and held at a gentle, repeatable pressure - the low-pressure type regulator and psi gauge on this unit let the operator set and read that point directly.
Size and port step up with flow demand: this 300-size unit carries a 3/8 in NPT port - step to 400 or 600 for larger lines, or down to 200 for compact circuits. The low-pressure regulator type in this code is the right choice where the working pressure sits well below standard ranges; the exact adjustment range for the low-pressure type is not published, so confirm it with us against your setpoint. The differential-pressure drain bleeds the bowl automatically as flow passes, with no operator action needed. Filtration is the 40 um standard grade; specify the W suffix for 5 um where finer protection is required. The square gauge here reads psi; MPa and bar scales are available. Thread is NPT as ordered, with PT and G offered as catalogue options. This configuration ships without a mounting bracket - add the bracket code if panel or wall fixing is needed.
Because flow is published as curves and not 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. 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 as a single rated number, so we do not quote a figure. Tell us your application and we will confirm the flow data from the datasheet on request before you order.
The K in the code GFR30010LJF2TK means a reverse (check) valve is fitted, so downstream pressure is held if the upstream supply is lost. The F2 code means the embedded square gauge is included and reads in psi; MPa and bar scales are available as options, and an external round gauge can be fitted 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.