The AirTAC GFR400-10L NPT3/8 AirTAC Filter Regulator 5 um Low-Pressure 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 AirTAC GFR400-10L is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This unit is the low-pressure type, intended for circuits that run below standard regulator pressures; the exact adjustment span for the L version is not published, so confirm it against your setpoint before ordering. It carries a 5 um filter element (the finer of the two catalogue grades), a differential-pressure drain as the catalogue default, and a built-in check valve that allows reverse flow to bypass the regulator. No gauge is fitted and no mounting bracket is included. Maximum inlet pressure is 1.0 MPa (145 psi), the working temperature range is -5 to 70 C (non-freezing), and the 400-size bowl is polycarbonate (PC).
This is a genuine AirTAC part. The GFR family is published in sizes 200, 300, 400 and 600 with ports from 1/8 to 1 inch, in PT (catalogue standard), G and NPT threads, with manual, automatic or differential-pressure drains, 40 um or 5 um elements, gauge options and a low-pressure type. Flow for this model is published as curves rather than a single rated figure, so send us your application details and we will confirm the figures from the datasheet on request.
| Model | GFR400-10L NPT3/8 AirTAC Filter Regulator 5 um Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT 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 | Not fitted |
| 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. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 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) |
Feeding low-pressure pneumatic clamps on a machining fixture: the 5 um element helps keep grit and water out of the clamp cylinders, the low-pressure type suits reduced clamping pressures, and the check valve lets downstream air bypass the regulator on reverse flow when supply dips.
Point-of-use conditioning for a carton-sealing or wrapping machine: filtered, regulated air to the actuators, with the differential-pressure drain clearing collected condensate through the shift without operator attention.
A regulated air drop at a spray booth or coating station, where the low-pressure type matches modest gun pressures and the 5 um grade helps keep water and particles out of the finish.
Size the GFR range by port and expected flow: sizes 200, 300, 400 and 600 step up in port and capacity, and this 400-size unit carries a 3/8 in NPT port. The choices coded into this model are the 5 um element (40 um is the standard grade if your air quality allows it), the differential-pressure drain (automatic and manual drains are the alternatives), the low-pressure regulator type, and the fitted check valve. A gauge can be ordered but none is fitted here, and the J code means no mounting bracket. Thread is NPT on this unit; PT is the catalogue standard and G is also available to order. Because flow is published as curves rather than 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 flow for the GFR range as curves, not as a single rated figure, so we do not quote a number here. Send us your application details - downstream demand, working pressure and line length - and we will confirm the flow figures from the datasheet on request before you order.
The L in the code marks the low-pressure type of regulator. Its exact adjustment range is not published in the catalogue, so we do not state one. If your setpoint falls below the standard range, tell us the target pressure and we will confirm suitability with AirTAC on request.
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.