The AirTAC AirTAC GFR300-10 Filter Regulator 3/8 in NPT, 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 size 300 configuration has 3/8 in NPT ports, a manual-drain polycarbonate bowl, a standard 40 um filter element, and the low-pressure regulator type. A round gauge reading in psi is fitted and a reverse/check valve is included; no mounting bracket is supplied (J code). Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and options include automatic or differential-pressure drains, a 5 um element (code W), square or round gauges with MPa, psi or bar scales, G (BSPP) or PT threads, and a mounting bracket. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| Model | AirTAC GFR300-10 Filter Regulator 3/8 in NPT, 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, 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". |
| 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. |
| 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) |
Filtering and regulating the low-pressure supply to the cylinder bank on a packaging machine's carton-sealing station, with the manual drain bled at shift start.
Supplying filtered, regulated air to the low-pressure clamping circuit of a machining fixture, where the check valve holds the set circuit against upstream dips.
Conditioning the air feeding diverter and stopper gates on a distribution conveyor, keeping moisture and scale out of the gate cylinders.
Size 300 with 3/8 in NPT ports sits mid-range in the GFR line; step down to size 200 or up to 400 or 600 as your air demand changes, and we can check the published flow curves against your application before you order. This unit is the low-pressure regulator type; the exact regulation range for the low-pressure version is not published on our sheet, so confirm it with us. The M code means a manual drain: collected water is bled by hand, so choose the automatic (A) or differential-pressure (blank) drain version if the unit will be hard to reach. The 40 um element is standard; specify code W for 5 um filtration. Gauge scales are available in MPa, psi or bar, and threads can be ordered in PT (standard) or G (BSPP) as well as the NPT fitted here. The J code means no mounting bracket is included.
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.
Flow for the GFR series is published as curves, not as a single rated figure, so we do not quote a number here. Send us your application details and we will confirm the datasheet flow curve and check the sizing for you before you order.
M is the manual-drain code: you open the drain by hand to expel water collected in the bowl. If the unit will be mounted where it is hard to reach, order the automatic (A) or differential-pressure (blank) drain version instead - and tell us which drain type you need so we can confirm the matching regulation figures for the low-pressure type.
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.