The AirTAC AirTAC GFR400-15 NPT1/2 Filter Regulator, 5 um, psi gauge 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 AirTAC GFR400-15 is a filter regulator: one body that removes water and particulate from compressed air and then regulates downstream pressure. This size 400 unit is ported 1/2 in NPT and carries a 5 um filter element (the finer of the two catalogue grades), a differential-pressure drain that bleeds collected condensate automatically as flow passes through, an embedded square pressure gauge reading in psi, and a built-in reverse/check valve that holds the set pressure if upstream supply is interrupted. It is supplied without a mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi), the standard regulation range is 0.15-0.9 MPa (20-130 psi), and the operating temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl gives a clear view of condensate level.
This is a genuine AirTAC part. The GFR family is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of PT, G or NPT thread, 40 um or 5 um filtration, differential-pressure, automatic or manual drains, and gauge scales in MPa, psi or bar. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| Model | AirTAC GFR400-15 NPT1/2 Filter Regulator, 5 um, psi gauge |
|---|---|
| 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 | Standard 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, 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). 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)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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) |
Feeds clean, pressure-controlled air to a CNC machining centre's tool-change and clamping circuits, with the 5 um element protecting fine pneumatic valves from particulate and the check valve holding the set pressure through supply dips.
Sits at the drop point of a packaging conveyor line, filtering and regulating the air that drives carton-forming and sealing cylinders, with the differential-pressure drain clearing condensate during continuous production runs.
Prepares air for the fixture clamps and weld-gun actuation in a robotic welding cell, where the psi-scaled gauge lets technicians verify set pressure at the cell and the 1/2 in port matches the cell's supply drop.
Start with the port step: size 400 with a 1/2 in NPT port suits lines whose consumption sits in the upper mid-range of the GFR family; step down to 300 or up to 600 if your piping and flow demand differ. This unit already carries the finer 5 um element (code W); the standard grade is 40 um if your application does not need finer filtration. The differential-pressure drain is the default and suits steady-flow installations; choose automatic (A) for intermittent flow or manual (M) where you want scheduled draining. The embedded square gauge here reads psi; MPa and bar scales are available, and an external round gauge is optional. PT is the standard thread and G or NPT are catalogue options to order - this unit is the NPT version. A bracket is optional (this configuration omits it), and code K adds the reverse/check valve fitted here. Because flow is published as curves rather than a single rated figure, send us your application details and we will confirm sizing against the datasheet 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 flow for the GFR series as curves, not as a single rated figure, so we do not quote a number here. Tell us your application's consumption and line pressure and we will confirm the relevant datasheet flow figures for this 1/2 in, size 400 unit before you order.
The differential-pressure drain is the catalogue default: it discharges collected condensate automatically as air flows through the bowl, with no operator intervention. If your flow is intermittent, the automatic drain (code A) is the better choice; if you prefer scheduled manual draining, choose code M. All three drain types are decodable options on the GFR family.
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.