The AirTAC GFR400-15LJNTK AirTAC Filter Regulator, NPT1/2, Low-Pressure 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 PT1/2" 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 GFR400-15LJNTK is a size 400 filter regulator: water and particulate filtration plus pressure regulation combined in one body. This configuration has a 1/2 in NPT port, the low-pressure regulator type, a 40 um standard filter element and a differential-pressure drain that bleeds collected condensate automatically as flow passes through. The polycarbonate bowl lets you see the condensate level, a reverse/check valve is fitted to hold downstream pressure, and no pressure gauge or mounting bracket is supplied with this code.
This is a genuine AirTAC part. The GFR family spans sizes 200 to 600 with port sizes from 1/8 in to 1 in, optional 5 um filtration (code W), automatic or manual drains, gauge options and G/NPT thread variants. Flow figures for this series are published as curves rather than a single rating, so ask us to confirm sizing and datasheet details against your application before ordering.
| Model | GFR400-15LJNTK AirTAC Filter Regulator, NPT1/2, Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (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 | 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. |
|---|---|
| 15 | Port size PT1/2". 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. |
| (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. |
| 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 · PT1/2" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
A fixture-clamping circuit that holds workpieces at a low setpoint benefits from the low-pressure regulator type, with the 40 um element keeping seal debris out of the clamp cylinders.
On a carton or bottling line, this unit filters the supply and holds a gentle, stable blowing pressure, while the check valve helps keep the circuit from dumping when upstream air drops.
For a valve-automation skid running low-pressure actuators, the combined filter and regulator in one body saves panel space, and the differential-pressure drain handles condensate in continuous service.
Size 400 with a 1/2 in port sits in the upper-middle of the GFR range, so step up or down by port size to match the air demand of the line. The low-pressure type (code L) is the choice where regulated pressure sits below what a standard unit is set up for; the exact adjustment window for this variant is not published, so confirm it with us. Drain is the differential-pressure type here, which suits steady flow; choose automatic (A) for intermittent duty or manual (M) where you want scheduled draining. Filtration is the 40 um standard element; specify W for 5 um only if downstream equipment demands finer air. This code ships without a gauge or bracket - add a gauge code if you need a visual setpoint, and note the reverse/check valve (K) is already fitted. Thread is NPT here; PT is the standard and G is also available as an order option.
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 number, so we do not quote a figure here. Tell us your application and we will confirm the flow curve and sizing from the datasheet on request before you order.
The L code selects the low-pressure regulator variant, intended for regulated pressures below the standard type's range; the exact adjustment window for this variant is not published, so confirm it with us. This specific code (N) carries no pressure gauge - gauge options with MPa, psi or bar scales can be ordered on other codes in the family.
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.