The AirTAC GFR400-10 AirTAC Low-Pressure Filter Regulator PT3/8 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 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 GFR400-10 is an AirTAC GFR-series filter regulator: it removes water and particulate from compressed air and holds downstream pressure at a set point, all in a single body. This configuration is the size 400 frame on a PT3/8 (3/8 in) port, with the 5 um filter element (code W), a differential-pressure drain, a low-pressure regulator type, a fitted round gauge reading in psi, and a built-in reverse (check) valve; the J code means no mounting bracket is included.
It is a genuine AirTAC part from the GFR filter-regulator line, which spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in and choices of drain type, filter grade, gauge style and scale, and thread. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing; the polycarbonate bowl suits these smaller sizes. Flow is published as curves rather than a single rating, so ask us to confirm sizing and datasheet figures for your application.
| Model | GFR400-10 AirTAC Low-Pressure Filter Regulator PT3/8 |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (PT thread) |
| Filtering grade | 5 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 — 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.
| 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". |
| (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). |
| C | Gauge shape: Round. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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) |
On a machining cell's clamping circuit, the GFR400-10 filters the shop air feeding the clamps and holds a steady low set point, so workpieces stay gripped consistently through every cycle.
On a carton-sealing or case-packing conveyor, the unit conditions the air feeding cylinders and diverters, with the built-in check valve holding the set point against backflow when upstream supply dips.
At a paint or coating booth, the 5 um element and a regulated low-pressure supply give spray equipment cleaner, steadier air, while the differential-pressure drain clears collected water during operation.
Start with the connection: this unit pairs the 3/8 in port with the size 400 body, the step to take when your line's air demand at that point calls for the larger frame. The W code selects the 5 um element, one grade finer than the 40 um standard element that is also available in the series. The drain here is differential-pressure, which bleeds the bowl as air passes; automatic and manual drains are the other catalogue choices. The fitted round gauge reads in psi, while embedded square gauges and MPa or bar scales are the alternatives. Thread is PT as standard, with G (BSPP) and NPT as order options, and no bracket is fitted with this code. Because flow is published as curves, not a single rating, 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 GFR400 flow as curves rather than a single rated figure, so we do not quote one number. Send us your application's air demand and we will confirm sizing and the full datasheet figures on request before you order.
L marks the low-pressure regulator type, intended for circuits set below the standard regulator's range; the exact range for this variant is not published, so we confirm it on request. W is the 5 um filter element, one grade finer than the 40 um standard element offered in the series.
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.