The AirTAC GFR400-10 AirTAC Low-Pressure Filter Regulator NPT3/8 is a genuine G-series filter regulator: water separation, 5 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 GFR400-10 is a filter regulator: one body removes water and particulate from compressed air and holds downstream pressure steady. This unit is the 400 size with a 3/8 in NPT port, carries the 5 um element (code W) for finer filtration than the standard 40 um, and drains by hand through its manual drain. It is the low-pressure (L) type; its exact adjustment range is not published in the material we hold, so we confirm it on request. A round gauge with bar scale is fitted, a reverse/check valve holds downstream pressure if the supply dips, and the PC (polycarbonate) bowl is standard at this size, with a mounting bracket included.
This is a genuine AirTAC part. The GFR family runs in 200, 300, 400 and 600 sizes with ports from 1/8 to 1 in, a choice of manual, automatic or differential-pressure drains, 40 um standard or 5 um filtration, square or round gauges in MPa, psi or bar scales, and PT, G or NPT threads. AirTAC publishes flow for this series as curves rather than a single rated figure, so ask us to confirm sizing and datasheet figures against your application before ordering.
| Model | GFR400-10 AirTAC Low-Pressure Filter Regulator NPT3/8 |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 5 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, 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.
| GFR400 | G-series filter regulator, 400 body — sets the port range. |
|---|---|
| 10 | Port size PT3/8". This body offers 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 3 | Gauge scale: bar. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 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 | GFR400 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Regulated low-pressure air to the clamping cylinders on a panel saw or machining centre. The 5 um element keeps spool valves clean, and the check valve holds clamp pressure if the main supply dips.
Feeds stoppers, pushers and diverter actuators on a carton or tray line. The manual drain lets an operator bleed off collected water at shift start, and the bar-scale gauge gives a local setpoint readout.
Supplies filtered, regulated pilot air to larger process valves or air-operated diaphragm pumps, where the low-pressure regulator type and the fine 5 um element suit sensitive pilot stages.
The real choices on a GFR unit are: size and port (200/300/400/600 with ports from 1/8 to 1 in - step up for higher air demand); drain type (manual as here, automatic, or the differential-pressure default); filter grade (40 um standard or 5 um with W - pick 5 um where downstream valves, cylinders or instruments are sensitive); gauge type and scale (embedded square is standard, external round as here, in MPa, psi or bar); thread (PT is the standard, G and NPT are order options - this unit is NPT); and bracket or no bracket. Flow for the series is published as curves, not a single rated number, so send us your air demand and we will confirm this 3/8 in size is right 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. Send us your air demand and line pressure and we will confirm against the datasheet whether the 3/8 in GFR400 size is right for your application.
Manual drain means an operator opens the bowl drain by hand to release collected water - simple and reliable where the unit is checked routinely. The L code marks the low-pressure regulator type; its exact adjustment range is not published in our material, so we confirm it on request. Automatic and differential-pressure drains are available in the same size if you prefer not to drain by hand.
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.