The AirTAC GFR400-15 AirTAC Low-Pressure Filter Regulator NPT1/2 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 size-400 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration carries a 5 um filter element (the finer W grade, versus the 40 um standard), a manual drain on the PC bowl, a low-pressure regulator type for circuits that run at reduced setpoints, an embedded square gauge scaled in MPa, and a built-in reverse/check valve. The ports are NPT1/2 (1/2 in) and the unit 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 from the GFR series, which 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, 40 um or 5 um filtration, gauge and thread options, and bracket choices. Flow figures for this series are published as curves rather than a single rated number, so we confirm the datasheet and sizing figures on request before you order.
| Model | GFR400-15 AirTAC Low-Pressure Filter Regulator NPT1/2 |
|---|---|
| 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, MPa 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. |
| 1 | Gauge scale: MPa. 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 machining cell where pneumatic clamps and swing cylinders hold parts during cutting, this unit filters the shop air to 5 um and holds a reduced, stable regulated supply to the clamping valves, with the MPa gauge giving the operator a direct setpoint readout.
In a spray booth where atomizing and actuation air must run at reduced pressure for finish quality, the low-pressure regulator type and fine 5 um element condition the branch feeding the spray valves, and the manual drain lets the booth operator bleed accumulated water each shift.
On a carton packaging line with air-driven diverters, pushers and stop gates running off a 1/2 in drop, this unit cleans the branch air and regulates it for the directional valves, while the check valve holds the downstream circuit against backflow when upstream supply dips.
Start with the size and port: size 400 with 1/2 in NPT threads suits lines plumbed at 1/2 in, and the larger G-series sizes carry more flow - match the step to your demand rather than oversizing. This unit is the low-pressure (L) type, chosen when the circuit holds a reduced setpoint; the exact adjustment range for the low-pressure type is not published in our sheet, so ask us to confirm it against your setpoint. The 5 um W element is the right pick when downstream valves or instruments want finer air than the 40 um standard; the manual (M) drain suits attended installations where an operator bleeds the bowl on a routine, while automatic or differential-pressure drains suit unattended duty. The square gauge here reads in MPa; psi or bar scales and an external round gauge are alternatives. NPT is fitted on this code; PT is the standard thread and G (BSPP) is also orderable. Brackets are optional - this code omits one. Flow for the GFR series is published as curves, not a single rating, so send us your application and we will confirm sizing from 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 number, so we do not quote a rated flow, Cv or SCFM figure. Send us your application and required flow, and we will confirm the sizing against the datasheet curves on request before you order.
The M in GFR40015MLJF1WTK is the manual drain code: an operator opens the drain on the PC bowl to discharge collected water, which suits attended installations on a routine. If the unit will sit unattended, the same size is orderable with an automatic (A) or differential-pressure (blank) drain - just ask for the alternative code.
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.