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 automatic 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 one body. This 300-size unit is specified with a 3/8 in NPT port, the standard 40 um filter element, and an automatic drain that expels collected condensate without manual attention. It is the low-pressure type, and the fitted square gauge reads in bar so operators can see and set downstream pressure at a glance. A reverse (check) valve is fitted, and the mounting bracket is included.
This is a genuine AirTAC part from the GFR range, which spans sizes 200 to 600 with port options from 1/8 to 1 inch. Thread options (PT standard, G and NPT), drain types, filter grades and gauge scales are available across the series. Flow is published as curves rather than a single rated figure, so we confirm the datasheet and sizing figures 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, bar 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". |
| A | Drain: Automatic 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. |
| (blank) | Mounting bracket included. |
| (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. |
| 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) |
Pneumatic clamps and hold-downs on carton-sealing or case-packing stations often run at reduced pressure. This unit filters the shop air, holds the set pressure steady, and its automatic drain keeps condensate out of the clamp cylinders on a line that runs unattended.
Spray guns and atomising applicators need clean, moisture-free air at a stable, modest pressure. The 40 um element knocks out water and particulate ahead of the gun, the bar-scale gauge lets the operator set the atomising pressure, and the check valve holds the setting against backflow.
Guide rollers, tensioners and diverter actuators along a web-handling line need regulated low-pressure air. The 3/8 in NPT port feeds a bank of small cylinders, the automatic drain copes with condensate from long air runs, and the included bracket mounts the unit at the line drop.
Choose size by the flow your line needs: the 300 size with its 3/8 in NPT port sits in the middle of the GFR range, with 200 and 400/600 steps either side. Drain type is a real choice: automatic (as here) suits unattended duty, manual drain suits supervised points, and the differential-pressure default drains only when the element loads up. Filter grade is 40 um standard; specify 5 um (code W) where finer particulate removal matters. Gauge scale is bar here, with MPa and psi scales available, and an external round gauge is an alternative to the embedded square gauge. PT is the standard thread; G and NPT are order options, as selected on this unit.
One honest note before ordering: AirTAC publishes flow as curves, not a single rated number, and the exact regulation range of the low-pressure type is not listed on the sheet we work from. Ask us to confirm sizing and the low-pressure range against your application before you order.
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 figure, so we do not quote a number here. Tell us your application and we will confirm the flow curve and correct sizing from the datasheet on request before you order.
The L in the code marks the low-pressure regulator type, intended for circuits that run below the standard regulator band; its exact range is not published on the sheet we work from, so we confirm it on request. The K code means a reverse (check) valve is fitted, which prevents downstream air from flowing back through the unit. The square gauge on this unit reads in bar.
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.