The AirTAC GFR300-10 AirTAC Filter Regulator NPT3/8, Auto Drain 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 300-size filter regulator that removes water and particulate from compressed air and holds a regulated downstream pressure in one body. This configuration has a 3/8 in NPT port, an automatic drain that discharges collected condensate without manual attention, a 40 um standard filter element, a round pressure gauge scaled in MPa, and a built-in reverse (check) valve that helps hold downstream pressure if the upstream supply dips. The polycarbonate bowl suits the 300 frame, and the standard regulator covers a 0.15-0.9 MPa (20-130 psi) setting range with a maximum inlet pressure of 1.0 MPa (145 psi). Operating temperature is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family is published in 200, 300, 400 and 600 sizes with port options from 1/8 to 1 in, PT as the standard thread and G (BSPP) or NPT as order options, automatic, manual or differential-pressure drains, a 5 um element (code W), gauge and scale choices, and an optional mounting bracket (this J-coded unit ships without a bracket). Flow is published as curves rather than a single rated figure, so ask us to confirm sizing or any datasheet figure for your application before ordering.
| Model | GFR300-10 AirTAC Filter Regulator NPT3/8, Auto Drain |
|---|---|
| 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 | Standard 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 — round, MPa 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). 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)). |
| (blank) | Standard 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. |
| 1 | Gauge scale: MPa. 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) |
Installed at the point of use ahead of the solenoid valves and clamping cylinders on a CNC machining centre, this unit strips water and swarf-carrying particles from the shop air and holds a steady regulated pressure for clamping and tool-change actuation. The automatic drain suits an unattended cell, and the check valve helps hold downstream pressure through compressor unload dips.
Mounted at an assembly bench feeding impact drivers, air ratchets and small cylinders, the GFR300-10 gives each station its own clean, regulated air supply instead of relying on a shared header setting. The round MPa gauge lets the setter dial in the station pressure, and the 40 um element protects the tools from rust and pipe scale.
Fitted upstream of the valve island on a carton-sealing or case-packing machine, this filter regulator conditions the air that cycles the sealing jaws and product-push cylinders. The automatic drain keeps condensate out of the valves during multi-shift running, and the check valve limits pressure decay when the plant compressor unloads.
Size the GFR frame to the air demand of the machine, not just the pipe: 300 is the mid frame, and the 3/8 in NPT port here should match or step up from the line it feeds as flow requirements grow. Choose the drain to match attendance: automatic (this unit) for unattended or hard-to-reach installations, manual where an operator drains routinely, or differential-pressure as the default. The 40 um element is the standard grade; specify the 5 um W option where downstream valves or instruments need finer filtration. The round gauge here is scaled in MPa; psi and bar scales and an embedded square gauge are available. PT is the standard thread, with G (BSPP) and NPT as catalogue options to order, and the J code means no mounting bracket is fitted - order one if the unit will be wall or panel mounted. Because AirTAC publishes flow as curves rather than a single rated figure, send us your application details and we will confirm the correct size against the datasheet 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 GFR300 flow as performance curves rather than a single rated figure, so we do not quote a number that could mislead your sizing. Tell us your application - working pressure, downstream consumers and line length - and we will confirm the flow and the correct frame size against the datasheet on request before you order.
The A code in GFR300-10 means an automatic drain: collected condensate is discharged from the polycarbonate bowl without an operator opening anything. Choose automatic for unattended cells, elevated or enclosed mounting positions, or any installation that is awkward to reach; manual and differential-pressure drains are the alternatives in the same frame if your maintenance routine prefers them.
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.