The AirTAC GFR400-15LF1TK 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 GFR400-15LF1TK is a size 400 filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the low-pressure type, fitted with a 40 um standard filter element, a differential-pressure drain on the polycarbonate bowl, an embedded square gauge scaled in MPa, and a reverse/check valve to hold downstream pressure if the supply drops. The port is NPT1/2 (1/2 in NPT thread).
This is a genuine AirTAC part from the GFR400 series, one of four sizes (200/300/400/600) with port options from 1/8 to 1 inch and PT, G or NPT threads. The exact low-pressure regulation range is not published in the material we hold, and flow is published as curves rather than a single rating, so we confirm both from the datasheet on request.
| Model | GFR400-15LF1TK 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 | Fitted — square, MPa scale |
| 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. |
| (blank) | Mounting 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. |
| (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 machining centre where workpieces are held by air clamps running at reduced pressure, this low-pressure type filter regulator cleans the supply, holds set pressure with its check valve, and shows the setting on the MPa gauge.
Form-fill-seal and cartoning machines need filtered air at a gentle, stable pressure at the sealing jaws. The 40 um element protects the valves, the differential-pressure drain sheds collected water, and the regulator sets the jaw pressure.
Spray and coating lines running at low line pressure use this unit to strip water and particles before the gun and to regulate the atomising air, with the check valve preventing backflow through the bowl.
Size 400 with a 1/2 in port suits lines with substantial air demand; step down to size 200/300 or up to 600 to match your pipe size and flow curve. The low-pressure type (code L) is the right choice where the working pressure sits in the lower part of the regulator's range - ask us to confirm the exact range from the datasheet before ordering. Drain is differential-pressure as coded; automatic (A) and manual (M) bowls are available in the series if you prefer. The 40 um element is standard; specify W for the 5 um grade. Gauge is the embedded square type scaled in MPa (psi or bar scales are order options), the reverse/check valve (K) is fitted, the mounting bracket is included, and the thread here is NPT - PT and G are the other order options. Because flow is published as curves rather than a single rating, ask us to confirm sizing against your application before ordering.
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 GFR400 series as curves, not as a single rated figure, so we do not quote a number here. Tell us your application and we will confirm the flow from the datasheet on request, along with the exact low-pressure regulation range, which is likewise not published in the material we hold.
K means a reverse/check valve is fitted, so downstream pressure is held if the upstream supply is lost. The drain on this unit is the differential-pressure type (no drain letter in the code): it discharges collected condensate automatically as the pressure differential across the filter rises. Automatic (A) and manual (M) drains are available as order options.
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.