The AirTAC AirTAC GFR400-15 Filter Regulator 1/2 in NPT 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 GFR400-15 is a filter regulator: water and particulate removal plus downstream pressure regulation combined in one body. This size 400 unit carries a 1/2 in NPT port and a 40 um standard filter element, with a differential-pressure drain that discharges collected condensate automatically as flow passes through. It is the low-pressure (L) type, fitted with an embedded square gauge reading in bar, and a reverse/check valve (K) is included so downstream pressure is held when upstream supply is interrupted. Maximum inlet pressure is 1.0 MPa (145 psi), the PC (polycarbonate) bowl suits non-freezing compressed air from -5 to 70 C, and a mounting bracket is included.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, optional 5 um (W) filtration, automatic or manual drains, alternative gauge scales, and G (BSPP) or NPT thread options. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application on request.
| Model | AirTAC GFR400-15 Filter Regulator 1/2 in NPT 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 | 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. |
| 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. |
| 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 fixture-clamping circuit that works at reduced line pressure, this unit filters the supply and holds a stable low setpoint, with the check valve keeping clamps pressurised if the main supply drops.
Feeding bench-top or pilot-scale pneumatic equipment that runs below standard plant pressure, the 40 um element protects downstream devices while the bar gauge gives a clear local setpoint reading.
On a packaging line where nozzles blow debris off belts at reduced pressure, the filter regulator conditions the air and the differential-pressure drain keeps condensate out of the blow-off air.
Start with the port step: size 400 with a 1/2 in NPT thread suits lines that need more flow than the 300 series 3/8 in step, but match the size to your demand using the published flow curves rather than a single rating. Drain choice is decodable: differential-pressure (this unit, blank code) discharges with flow, automatic (A) empties regardless of flow, and manual (M) is emptied by hand. Filter grade is 40 um standard here; specify W for the 5 um element if finer particulate removal is needed. The gauge scale is set by the code (F3 = square, bar; MPa and psi scales are available), and the K code means a reverse/check valve is fitted. Thread is NPT on this unit; PT is the catalogue standard and G (BSPP) is an order option. A bracket is included. Note this is the low-pressure (L) type: its regulation range is not published as a single figure, so confirm it against your setpoint with us 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 GFR series as curves, not as a single rated figure, so we do not quote a number. Tell us your line pressure, setpoint and air demand and we will confirm the sizing against the datasheet curves on request.
L is the low-pressure regulator type, F3 is the embedded square gauge with a bar scale, T is the NPT thread (PT is the catalogue standard and G/BSPP is an order option), and K means a reverse/check valve is fitted to hold downstream pressure.
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.