The AirTAC GFR400-15 AirTAC Filter Regulator NPT1/2 Low-Pressure is a genuine G-series filter regulator: water separation, 40 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 GFR400-15 is an AirTAC GFR-series filter regulator: water and particulate filtration plus pressure regulation combined in a single body. This size 400 unit is configured with 1/2 in NPT ports, a manual drain bowl in polycarbonate, a 40 um standard filter element, and the low-pressure regulator type for circuits that run below standard line pressures. It comes fitted with an external round gauge scaled in psi and a reverse (check) valve, and is supplied without a mounting bracket. 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 filter-regulator family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of manual, automatic or differential-pressure drains, a 5 um element option (code W), gauge style and scale choices, G/NPT thread options and bracket variants. Because flow is published as curves rather than a single rating, we confirm the datasheet and flow figures for your application on request.
| Model | GFR400-15 AirTAC Filter Regulator NPT1/2 Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (NPT thread) |
| Filtering grade | 40 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 — 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". |
| 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). |
| C | Gauge shape: Round. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 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" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
Filtering and regulating the air feeding cylinder-driven carton forming and case sealing stations on a packaging line, where the low-pressure regulator type holds a reduced working pressure for gentle clamping and pushing motions.
Setting a stable, reduced pressure for air clamps and light-duty pneumatic presses in fixture workholding, with the 40 um element protecting downstream valves from water and pipe scale and the check valve holding the set circuit on air loss.
Conditioning shop air at the drop to spray guns and coating applicators, removing condensed water and particles ahead of the gun while the low-pressure regulator type trims supply pressure to suit the applicator.
Start with the size and port: this unit is size 400 with 1/2 in NPT ports, one step up in flow capacity from the 300 series - match the port to your line and let the required air consumption drive the size choice. Drain type is a real decision: this configuration uses a manual drain, which means an operator opens the bowl drain periodically; choose the automatic or differential-pressure drain codes if the unit will be left unattended. The 40 um element is the standard grade; specify the W code for the 5 um element where finer filtration is needed. The fitted round gauge is scaled in psi; square embedded gauges and MPa/bar scales are alternatives. Thread is NPT here, while PT (standard) and G are orderable catalogue options. This unit ships without a bracket - add the bracket code if panel or wall mounting is needed. Note this is the low-pressure (L) regulator type; its exact regulation range is not published in the standard tables, so ask us to confirm it against your set pressure before ordering. Flow is published as curves, not a single rating, so send us your application details and we will confirm sizing from the datasheet.
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 there is no one l/min or SCFM number we can quote. Send us your line pressure, set pressure and expected air consumption, and we will confirm from the datasheet whether this size 400, 1/2 in port unit is correctly sized before you order.
The M code in GFR40015MLJC2TK means the bowl drain is opened by hand, which suits attended installations on a regular walk-round. If the filter regulator will sit unattended, the automatic drain (code A) or the differential-pressure drain (blank code) variants discharge condensate without operator action; both are catalogue options in the same size. Note that the regulation range also depends on drain type, so confirm the figures for your chosen variant with us.
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.