The AirTAC GR400-15LF1T AirTAC Air Regulator NPT1/2 Low-Pressure is a genuine G-series air pressure regulator. It holds a stable downstream pressure over the range 0.05 - 0.4 MPa (7 - 58 psi) with PT1/2" ports, and ships with a pressure gauge. A regulator does not filter the air — put a GF filter upstream, or use a GFR filter regulator, when water and particulate must also be removed.
The GR400-15LF1T is an AirTAC GR-series air pressure regulator: it does one job, holding downstream pressure steady at the value you set, and it contains no filter, no bowl and no lubricator. This is the 400 size with a 1/2 in NPT thread, built as the low-pressure type, so its setpoint range tops out at 0.4 MPa instead of the standard range - the right choice for circuits and actuators that must never see high supply pressure. A square pressure gauge is fitted as standard so the setpoint can be read directly at the unit.
This is a genuine AirTAC part. The GR line spans the 200, 300, 400 and 600 sizes with ports from 1/8 in to 1 in, PT as the standard thread and G or NPT as order options, with or without gauge, bracket or reverse/check valve. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application.
| Model | GR400-15LF1T AirTAC Air Regulator NPT1/2 Low-Pressure |
|---|---|
| Series | GR400 pressure regulator |
| Port size | PT1/2" (NPT thread) |
| Regulating range | 0.05 - 0.4 MPa (7 - 58 psi) |
| Pressure type | Low-pressure type |
| Bracket | Fixing bracket included |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -20 to +70 °C |
| Pressure gauge | Fitted — square, MPa scale |
| Reflux valve | Not fitted |
| Mounting | Panel mounting; optional fixing bracket |
Specifications follow the official AirTAC G-series air-preparation data. Note the GR temperature range is -20 to +70 °C, wider than the other G-series units. A regulator has no bowl and no filter element, so there is no filtering grade. Flow curves, weight and outline dimensions are not published in our data set — ask us and we will confirm from the factory datasheet.
| GR400 | G-series pressure regulator, 400 body — sets the port range. |
|---|---|
| 15 | Port size PT1/2". This body offers 10 = PT3/8", 15 = PT1/2". |
| L | Low-pressure type — 0.05 - 0.4 MPa (7 - 58 psi). Blank is standard, L is the low-pressure type. |
| (blank) | Fixing bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. C is round, F is square. |
| 1 | Gauge scale: MPa. 1 is MPa, 2 is psi, 3 is bar. |
| 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, type, bracket, gauge, gauge shape, scale, thread, reflux — a blank position takes the default. Example: GR300-08LNK is a 300 body, PT1/4", low-pressure type, no gauge, with 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 rather than from a single rated figure.
| This model | GR400 · PT1/2" · 0.05 - 0.4 MPa (7 - 58 psi) |
|---|---|
| One size down | GR300 |
| One size up | GR600 |
| Line order | Filter first, then regulator, then lubricator |
Clamping fixtures and soft-jaw vises on a CNC cell often need a deliberately limited holding pressure. This low-pressure GR regulator on the 1/2 in drop lets the setter dial in a setpoint below 0.4 MPa and read it on the fitted gauge, so delicate parts are held without over-clamping.
Hold-down rollers and product-push cylinders on a packaging line work best at a gentle, repeatable pressure. Feeding them through this 1/2 in NPT regulator keeps their supply constant even as the main header pressure wanders, and the square gauge gives the operator a visible setpoint.
In a factory where a 1/2 in branch feeds a group of air tools or actuators from a higher-pressure main, this GR400 regulator isolates that branch at a stable, limited pressure. The low-pressure range protects downstream equipment that is not rated for full line pressure.
Start with the port and size: the 400 size with a 1/2 in NPT thread suits lines where the supply pipework is already 1/2 in; step up to 600 or down to 300 depending on the flow your circuit needs. The decisive choice here is the low-pressure type: its adjustment range stops at 0.4 MPa, so pick this code only if your setpoint sits below that; for higher setpoints use the standard GR400. The fitted square gauge reads in MPa; other scale options exist in the range. NPT is the thread on this code, with PT and G available as order options. A mounting bracket is included, and the GR body can also be panel-mounted.
Because GR flow is published as curves rather than one rated number, send us your application details and we will confirm the datasheet figures and correct size before you order.
Quick checklist
Without a reflux valve, air cannot flow back through the regulator — order the K option if reverse flow is required. A regulator does not remove water or particulate; that is the filter's job.
AirTAC publishes GR flow as curves, not as a single rated figure, so we do not quote a number here. Tell us your upstream pressure, setpoint and expected air consumption, and we will confirm the datasheet flow curve and check the 400 size against your application before you order.
The L in the code marks the low-pressure type, whose adjustment range tops out at 0.4 MPa - ideal where downstream equipment must be protected from high pressure. If your setpoint needs to go higher, choose the standard GR400 instead, which adjusts up to 0.9 MPa. Maximum inlet pressure is 1.0 MPa (145 psi) and the GR works from -20 to 70 C, wider than the rest of the G 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.