The AirTAC GFR400-15 NPT AirTAC Filter Regulator, 1/2 in, 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 manual drain and regulates 0.05 - 0.9 MPa (7 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The AirTAC GFR400-15MF3WT is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This 400-size unit is specified with a 1/2 in NPT port, a manual drain bowl, a 5 um filter element (the finer of the two catalogue grades), an embedded square gauge reading in bar, and a standard regulator with an adjustment range of 0.05-0.9 MPa (7-130 psi). Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR filter-regulator family is published in sizes 200, 300, 400 and 600, with port options in PT (standard), G and NPT, drain choices (differential-pressure, automatic or manual), 40 um or 5 um filtration, gauge and scale options, and an optional reverse/check valve. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application.
| Model | GFR400-15 NPT AirTAC Filter Regulator, 1/2 in, 5 um |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual 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. Standard type, regulating 0.05 - 0.9 MPa (7 - 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 130 psi)). |
| (blank) | Standard 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. |
| 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. |
| (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" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
Feeding filtered, regulated air to the tool-change and clamping circuits of a CNC machining centre, where the 5 um element helps keep moisture and chips-borne debris out of the actuator valves.
Conditioning the air feeding a lab bench with pneumatic test rigs and air bearings, where the bar-scale gauge gives operators a direct reading at the bench and the manual drain suits a supervised environment.
Supplying regulated air to carton sealing and taping heads on a packaging line, with the filter-regulator mounted at the drop so operators can set line pressure locally and drain the bowl at shift checks.
Size and port set the capacity: this is the 400 size with a 1/2 in NPT port, the larger step above 300 for heavier air demand. The 5 um element (code W) suits points of use that need finer air than the 40 um standard grade. The manual drain means an operator opens the bowl drain during checks rather than relying on an automatic or differential-pressure drain, so plan a walk-round routine. The square gauge is fitted with a bar scale; MPa and psi scales and an external round gauge are the other catalogue choices. Thread is NPT here; PT is the standard and G is also an order option. A mounting bracket is included.
Because flow is published as curves and not as a single rated number, we cannot quote a rated flow for this unit. Send us your application details and we will confirm sizing against the datasheet curves before you order.
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 flow for the GFR series as curves, not as a single rated figure, so we do not quote a rated flow, Cv or SCFM number. Tell us your application and required flow and we will confirm the sizing from the datasheet curves on request before you order.
The M in the code specifies a manual drain bowl: moisture collected by the 5 um filter element is released by opening the drain during routine checks. The catalogue also offers automatic and differential-pressure drains on the GFR family if you prefer a drain that works without operator action.
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.