The AirTAC GFR40015ALNTK 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 automatic 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 series combines water and particulate filtration with pressure regulation in a single body, so one 1/2 inch connection handles both jobs in the air-preparation line. This unit is the 400 size with NPT threads, an automatic drain that bleeds collected condensate from the PC bowl without manual attention, a 40 um standard filter element, the low-pressure regulator type, a built-in reverse/check valve, and a mounting bracket included. No gauge is fitted on this configuration.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600, with PT as the standard thread and G or NPT as order options, manual or differential-pressure drains besides this automatic version, a 5 um element as the W option, and gauge choices where a gauge is fitted. Flow is published as curves rather than a single rating, so ask us to confirm the sizing and datasheet figures for your application before ordering.
| Model | GFR40015ALNTK 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 | Automatic 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". |
| A | Drain: Automatic 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. |
| 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) |
On a workshop pneumatic press fed from a shared ring main, this unit filters water and scale out of the supply and holds a steady reduced pressure to the press cylinder, with the check valve keeping the circuit charged if the main drops.
On a carton-sealing or wrapping line running continuously, the automatic drain clears condensate from the bowl without operator visits, protecting downstream valves and cylinders on a 1/2 inch supply drop.
For a fixture-clamping or low-pressure air-blow station that works at a reduced regulated band, the low-pressure regulator type matches the duty, while the 40 um element stops particulate reaching the clamps or nozzles.
Start with the port step: size 400 with 1/2 inch ports suits lines running larger cylinders or multiple downstream drops, while 200 and 300 sizes cover smaller circuits. The automatic drain on this unit suits unattended or hard-to-reach installations; choose manual or differential-pressure drain if you prefer operator-controlled or flow-triggered draining. The 40 um element is the standard grade for general plant air; specify the W code for the 5 um grade where finer protection is needed. This is the low-pressure regulator type, so confirm your working band with us. Thread is NPT here; PT is standard and G is available to order. A bracket is included, and the reverse/check valve holds downstream pressure on supply loss.
One honest note on sizing: flow data for this series is published as curves, not a single rated figure, so we cannot quote a number here. Send us your flow and pressure requirements and we will confirm the correct size from the datasheet before you order.
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 this series as curves rather than a single rated figure, so we do not quote a number here. Tell us your flow and working pressure and we will confirm the sizing against the datasheet on request before you order.
This configuration is ordered with code N, so no gauge is fitted; gauge options apply to configurations ordered with a gauge code. The K code here means a reverse/check valve is built in, which holds downstream pressure if the upstream supply fails - order without the K code if you do not want it.
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.