The AirTAC GFR400-15 AirTAC Filter Regulator G1/2 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 AirTAC GFR400-15 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 built with a G1/2 (BSPP) port, a manual drain bowl in polycarbonate, and a 40 um standard filter element. It is the low-pressure (L) regulator type, so it is intended for circuits that run below standard line pressures - confirm the exact adjustment range for your setting before ordering. A round external gauge scaled in psi is fitted, and a reverse/check valve (K) is built in to hold downstream pressure if the supply drops. No mounting bracket is included with this configuration.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8" to 1", and options for automatic or differential-pressure drains, a 5 um (W) filter element, embedded square or external round gauges in MPa, psi or bar scales, and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application.
| Model | GFR400-15 AirTAC Filter Regulator G1/2 Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (G (BSPP) 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. |
| G | G (BSPP) 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) |
Feeds pilot-air manifolds on process valve actuation skids that run below standard line pressure, where the low-pressure regulator type sets a reduced, stable supply and the check valve holds the pilot circuit if the main line drops.
Supplies filtered, regulated air to pneumatic clamps and swing cylinders on CNC machining fixtures, with the 40 um element protecting valve spools and the psi gauge letting setters verify clamp pressure at the cell.
Conditions the air feeding conveyor diverters, baggers and carton sealers on a packaging line, with the manual drain bled during shift changeovers and the G1/2 port matching the main drop to the line.
Size the GFR series by port and required flow: this 400-size unit carries a G1/2 port, one step above 3/8" and one below 3/4". Choose the drain to match maintenance routines - this unit has a manual drain, which suits installations where an operator can bleed the bowl on a schedule; automatic and differential-pressure drains are available on other configurations. The 40 um element is the standard grade; specify W for 5 um where finer filtration is needed. The fitted round gauge reads in psi; square embedded gauges and MPa or bar scales are the other catalogue options. Thread here is G (BSPP); PT is the standard thread and G/NPT are order options, so match your piping. No bracket is fitted with this code. Flow is published as curves, not a single rating, so ask us to confirm sizing 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 the GFR series as characteristic curves, not as a single rated number, so we do not quote a rated flow, Cv or SCFM figure. Send us your application details and we will confirm the flow curve and correct sizing from the datasheet on request.
The M in the code means the polycarbonate bowl has a manual drain: an operator opens it to bleed accumulated water, which suits attended installations on a maintenance schedule (automatic and differential-pressure drains are available on other GFR codes). The L code marks the low-pressure regulator type, intended for circuits running below standard line pressure; its exact adjustment range is not published in the standard table, so confirm it with us before ordering.
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.