The AirTAC AirTAC GFR400-10LJF2WG Low-Pressure Filter Regulator G3/8 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 AirTAC GFR400-10LJF2WG is a size 400 filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration carries a 5 um filter element (the finer of the two published grades), a differential-pressure drain that bleeds collected condensate automatically when the pressure differential across the element rises, and a low-pressure regulator type for circuits that run below standard working pressures. It is fitted with an embedded square gauge scaled in psi, has no reverse/check valve, and ships without a mounting bracket. The G thread gives G3/8 (BSPP) ports.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600, with port options from 1/8 to 1 inch, G (BSPP) or NPT threads to order, 40 um standard or 5 um (W) filtration, differential-pressure, automatic or manual drains, square or round gauges in MPa, psi or bar scales, and optional brackets. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application before ordering.
| Model | AirTAC GFR400-10LJF2WG Low-Pressure Filter Regulator G3/8 |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (G (BSPP) 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 — square, psi scale |
| Reflux valve | Not fitted |
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). |
| F | Gauge shape: Square. 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. |
| G | G (BSPP) thread. PT is the default; G is BSPP and T is NPT. |
| (blank) | No reverse-flow valve (the default). |
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 clamping and hold-down cylinders on a carton-sealing or wrapping line, where the 5 um element protects seals and the regulator holds a gentle, repeatable clamp pressure.
Conditioning supply air for spray booths, coating heads or lab enclosures that need fine particulate removal and a stable, reduced pressure rather than full line pressure.
Regulating air to loom and spinning-machine actuator banks that run at reduced pressure, with the 5 um grade guarding against lint-laden line contamination reaching the valves.
Start with the port step: size 400 with 3/8 inch ports sits in the middle of the GFR range - step up to size 600 or down to 300/200 depending on the pipe size of the circuit, then ask us to check the published flow curves against your demand before ordering. This unit is already specified with the 5 um (W) element; the standard grade is 40 um if a downstream application does not need the finer filtration. The differential-pressure drain is the default and suits most fixed installations; an automatic drain (A) or manual drain (M) can be ordered instead. The fitted square gauge reads in psi; round external gauges and MPa or bar scales are alternatives. PT is the standard thread, with G (BSPP) and NPT as order options - this unit is ordered with G. Brackets are optional; this code omits one.
Note that this is the low-pressure type (L). The catalogue does not publish a numeric adjustment range for the low-pressure version, so confirm the working band you need with us and we will verify it against the datasheet before you order.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. Without the K option, air cannot flow back 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 number, so we do not quote a figure here. Tell us your line pressure and the air demand of the equipment downstream, and we will confirm the correct size and flow from the datasheet on request before you order.
L marks the low-pressure regulator type, for circuits that run below standard working pressures. The catalogue does not publish a numeric adjustment range for the low-pressure version, so send us the outlet pressure band your application needs and we will confirm it against the datasheet 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.