The AirTAC AirTAC GFR400-10 NPT3/8 Low-Pressure Filter Regulator 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 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 GFR400-10 is a low-pressure filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This size 400 unit is supplied with a 3/8 in NPT port, the standard 40 um filter element, a differential-pressure drain that bleeds condensate automatically as flow passes through, and a round pressure gauge scaled in psi. The polycarbonate bowl suits the -5 to 70 C (non-freezing) operating range, and the mounting bracket is included.
This is a genuine AirTAC part. The GFR family is offered in sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, a choice of differential-pressure, automatic or manual drains, an optional 5 um element (code W), square or round gauges with MPa, psi or bar scales, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm the figures against your application before ordering.
| Model | AirTAC GFR400-10 NPT3/8 Low-Pressure Filter Regulator |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 40 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 | 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. |
| (blank) | Mounting bracket included. |
| (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. |
| (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. |
| (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" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Feeding filtered, regulated air to the cylinders and actuators on a carton-forming or wrapping line, where the low-pressure type keeps supply at the modest setting the machine was designed around.
Regulating clamping pressure on a light-duty pneumatic press or workholding fixture, with the 40 um element protecting the valve stack from water and pipe scale carried in shop air.
Conditioning the air feeding looms and winding heads, where the differential-pressure drain carries off condensate during continuous running and the psi gauge lets operators verify set pressure at a glance.
Size 400 with a 3/8 in port sits in the upper-middle of the GFR range; step up to 600 or down to 300 depending on the flow your line needs, and confirm the match with us since flow is published as curves, not a single rating. Drain choice matters: the differential-pressure drain on this unit needs no attention but only purges while air flows, whereas an automatic drain (code A) purges on a cycle and a manual drain (code M) is emptied by hand. The standard element is 40 um; specify W for 5 um where finer filtration is required. This is the low-pressure (L) type, so confirm the regulation range suits your circuit. Gauge scale options are MPa, psi or bar, and threads are available as PT (standard), G or NPT.
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 GFR flow as performance curves rather than a single rated figure, so we do not quote a number here. Tell us your line pressure and the flow your application needs and we will confirm the sizing against the datasheet before you order.
The L code marks this as the low-pressure regulator variant rather than the standard type. Its exact regulation range is not published in the material we hold, so confirm your required setting with us and we will verify it against the datasheet. Everything else on this unit is standard GFR400: 3/8 in NPT port, 40 um element, differential-pressure drain, round psi gauge and included bracket.
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.