The AirTAC AirTAC GFR40015LF3T 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 GFR40015LF3T is a size 400 filter regulator: one body that removes water and particulate from compressed air and regulates downstream pressure. This configuration is the low-pressure type (code L), fitted with a square gauge scaled in bar, the standard 40 um filter element and a differential-pressure drain. The 1/2 in NPT port suits main drop lines and larger pneumatic circuits. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C, non-freezing. The size 400 bowl is polycarbonate (PC), so the condensate level is visible at a glance.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, filter grades of 40 um standard or 5 um (code W), manual, automatic or differential-pressure drains, PT, G or NPT threads, and optional external round gauges in MPa, psi or bar scales. Flow is published as curves rather than a single rated figure, so send us your application details and we will confirm the sizing and full datasheet figures on request.
| Model | AirTAC GFR40015LF3T 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, bar 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. |
|---|---|
| 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. |
| 3 | Gauge scale: bar. 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 · PT1/2" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
On a clamping line that runs at reduced pressure, the low-pressure regulator holds the setting for the clamp cylinders while the 40 um element and drain keep water and swarf out of the valves downstream.
Feeding a machine tool's pneumatic circuits from a 1/2 in main drop, the unit filters the shop air and regulates it before the machine's own solenoid valves and air-assist functions.
On a carton-forming or wrapping line, the filter regulator conditions the air feeding the transfer and sealing cylinders, with the bar-scaled square gauge giving operators a visible pressure reference.
Size 400 with a 1/2 in port sits in the upper-middle of the GFR range; step down to 300/200 or up to 600 as your circuit size changes - because flow is published as curves, not a single rating, ask us to confirm the sizing against your application before ordering. The low-pressure type (code L) is the right choice where the circuit works well below standard regulator settings; its exact adjustment range is not published in our sheet, so confirm it with us. The 40 um element is standard here; specify code W for 5 um where finer filtration is needed. This unit is configured with a square gauge scaled in bar (MPa and psi scales are order options), a differential-pressure drain, an included mounting bracket, and no reverse/check valve. The thread on this code is NPT; PT is the standard thread and G (BSPP) is also available as an order option.
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 G-series flow as performance curves rather than a single rated figure, so we do not quote a rated flow number. Send us your application - port size, circuit pressure and the equipment you are feeding - and we will confirm the sizing against the datasheet curves on request before you order.
Yes. T on this model means a 1/2 in NPT port. PT is the standard thread across the GFR range, and G (BSPP) is a catalogue option you can order - state the thread you need as a specification when enquiring, and we will decode and confirm the exact code for you.
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.