The AirTAC GFR400-15 AirTAC Filter Regulator NPT1/2 Low-Pressure is a genuine G-series filter regulator: water separation, 5 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 GFR400-15 is a filter regulator: one body that removes water and particulate from compressed air and then regulates downstream pressure. This 400-size unit is built with 1/2 in NPT ports, a 5 um filter element (code W), an automatic drain that expels collected condensate without manual attention, and the low-pressure regulator type for circuits that run at reduced working pressure. A round external gauge on a psi scale is fitted, and a reverse/check valve is included, so the set-point holds while downstream pressure is monitored directly.
This is a genuine AirTAC part in the GFR400 series. The GFR family spans sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, a choice of 40 um standard or 5 um fine filtration, differential-pressure, automatic or manual drains, standard or low-pressure regulation, and embedded square or external round gauges in MPa, psi or bar scales. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR400-15 AirTAC Filter Regulator NPT1/2 Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (NPT thread) |
| Filtering grade | 5 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 | Fitted — round, psi 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". |
| 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 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" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
A low-pressure clamp circuit on a CNC fixture needs clean, moisture-picked air held at a reduced set-point. The GFR400-15 filters water and chips-carried particulate to 5 um, regulates the clamp pressure, and its automatic drain keeps condensate out of the fixture valves during unattended shifts.
On a cartoning or wrapping line, sealing cylinders and vacuum generators run at reduced pressure and are sensitive to water carry-over. This unit's 5 um element and automatic drain protect the actuators, while the fitted psi gauge lets operators verify the set-point at the machine.
Blow-off nozzles along a food or parts conveyor run at low regulated pressure and clog quickly if the air is wet or dirty. The GFR400-15's 5 um filtration, automatic drain and reverse/check valve keep the blow-down circuit clean and hold its setting between shifts.
Start with the port step: size 400 carries 1/2 in ports, and the G-series ladder runs 200/300/400/600 from 1/8 in to 1 in, so pick the size whose flow curve covers your demand - we will confirm the curve against your application. This unit is already configured with the 5 um element (W), automatic drain (A), low-pressure regulator type (L), round psi-scale gauge (C2), NPT thread (T) and reverse/check valve (K), and ships without a mounting bracket (J). If your line needs coarser 40 um filtration, a manual or differential-pressure drain, a square embedded gauge, MPa or bar scales, G (BSPP) or PT threads, or a bracket, those are catalogue options on the same series - tell us and we will decode the matching code. Flow is published as curves, not a single rating, so ask us to confirm sizing 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 G-series flow as performance curves, not as a single rated number, so we do not quote a l/min, SCFM or Cv figure here. Send us your application's air demand and line pressure and we will confirm the curve and datasheet figures for this exact configuration before you order.
The A in the code selects the automatic drain: collected condensate is expelled from the bowl without anyone opening a valve, which suits unattended or hard-to-reach installations. The L selects the low-pressure regulator type, for circuits that operate at reduced working pressure; the exact adjustment range for the low-pressure type is not published, so we confirm it on request. The bowl is polycarbonate at this size, and the temperature range is -5 to 70 C, non-freezing.
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.