The AirTAC GFR400-15 AirTAC Filter Regulator PT1/2 Low-Pressure 5 um 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 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 GFR400-15 is an AirTAC GFR-series filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This size 400 unit is supplied with a 1/2 in PT port, a 5 um filter element (the W grade, finer than the 40 um standard), a differential-pressure drain, a low-pressure regulator, a round psi gauge and a reverse/check valve, and it includes a mounting bracket. The polycarbonate bowl suits this size; only size 600 units use an aluminium alloy bowl.
It is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, PT, G or NPT threads, manual, automatic or differential-pressure drains, 40 um or 5 um elements, and gauge and scale options. Max inlet pressure is 1.0 MPa (145 psi) and working temperature is -5 to 70 C, non-freezing. Flow is published as curves rather than a single rating, so ask us to confirm figures from the datasheet for your application.
| Model | GFR400-15 AirTAC Filter Regulator PT1/2 Low-Pressure 5 um |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (PT 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 | Differential-pressure 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". |
| (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). |
| 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. |
| (blank) | PT 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) |
Supplies filtered, regulated air to pneumatic clamps on a machining fixture where the clamp pressure must sit below the standard regulator range; the 5 um element protects the clamp valves from water and fine debris.
Point-of-use filter regulator on a packaging line: condensate and fine dust are collected in the differential-pressure bowl while the low-pressure regulator holds a gentle set point for forming or sealing cylinders.
Regulates filtered air to bench instruments and test rigs that need low supply pressure, with the round psi gauge giving a direct local readout and the check valve holding the setting if upstream pressure dips.
Size 400 with a 1/2 in PT port suits lines plumbed at 1/2 in; step up or down through sizes 200 to 600 as your air demand changes, and we can check the flow curves against your consumption before you order. The W code gives the 5 um element instead of the 40 um standard; choose it where downstream valves and instruments need finer air. The low-pressure regulator is intended for circuits set below the standard range; its exact range is not published, so confirm your set point with us. The round psi gauge is fitted here; embedded square gauges with MPa, psi or bar scales are the catalogue alternatives. Thread is PT as standard, with G and NPT available to order, and the bracket is included.
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 curves, not as a single rated figure, so we do not quote a number here. Send us your line pressure, set pressure and air consumption and we will confirm from the datasheet whether this 1/2 in size 400 unit is correctly sized for your application.
The L code makes this a low-pressure regulator variant, intended for set points below what the standard type covers. The exact range for the low-pressure version is not published in the catalogue, so tell us your set pressure and we will confirm suitability on request.
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.