The AirTAC GFR400-15 AirTAC Filter Regulator NPT1/2 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 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 GFR400-15 is a filter regulator: it removes water and particulate from compressed air and holds downstream pressure at your set point in a single body. This size 400 configuration gives you a 1/2 in NPT port, the finer 5 um filter element, a manual drain on the polycarbonate bowl, the low-pressure regulator type, an embedded square gauge reading in psi, and a built-in reverse (check) valve; no mounting bracket is included. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, and published options for thread (PT is the standard; G and NPT are order options), drain type, filter grade, gauge and scale, and bracket. Flow is published as curves rather than a single rating, so ask us to confirm the figures from the datasheet for your application.
| Model | GFR400-15 AirTAC Filter Regulator NPT1/2 Low-Pressure 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 | 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 | Manual 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. 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 130 psi)). |
| L | Low-pressure 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) |
On a CNC fixture circuit that clamps workpieces at reduced pressure, this unit filters the shop air to 5 um and holds the low set point the clamp cylinders need, with the check valve holding the circuit if upstream pressure dips.
Divert gates and pushers on a packaging conveyor often run best at reduced pressure to avoid jolting product. This filter regulator cleans the air feeding those actuators and lets an operator set the pressure from the psi gauge.
Pneumatically piloted process valves need clean, steady low-pressure air to shift reliably. This unit conditions the pilot supply, traps water and particles at 5 um, and the manual drain lets maintenance clear the bowl during scheduled rounds.
Size and port are the first decision: the GFR family steps through sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, chosen against the flow your line needs - we can check the published curves with you. For this unit the decodes are fixed: 1/2 in NPT thread (PT is the standard; G and NPT are order options), the 5 um element instead of the standard 40 um, a manual drain, the low-pressure regulator type, a square gauge scaled in psi and a reverse (check) valve, with no mounting bracket. If you would rather not drain the bowl by hand, automatic and differential-pressure drain versions exist within the family. Because flow is published as curves and not a single rated figure, confirm sizing with us against your application 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 this family as curves rather than a single rated figure, so we do not quote one number. Tell us your line pressure and the equipment you are feeding, and we will confirm the flow from the datasheet on request before you order.
A manual drain means collected water is expelled by opening the drain on the bowl by hand, so it suits installations checked during routine rounds. Automatic and differential-pressure drain versions are available on other GFR codes in the same family if you prefer self-draining operation.
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.