The AirTAC GFR400-15 AirTAC Filter Regulator, NPT 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 GFR400-15 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This size 400 unit is specified with a 1/2 in NPT port, a fine 5 um filter element (the W grade, tighter than the 40 um standard), a manual drain on the PC bowl, an embedded square gauge reading in bar, and a reverse/check valve fitted to hold downstream pressure. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. With manual drainage, the regulation range is 0.05-0.9 MPa (7-130 psi).
This is a genuine AirTAC part. The GFR family is published in sizes 200, 300, 400 and 600 with a choice of PT, G or NPT thread, differential-pressure, automatic or manual drain, 40 um or 5 um filtration, gauge scale, bracket and check-valve options. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet and sizing figures for your application on request.
| Model | GFR400-15 AirTAC Filter Regulator, NPT 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 | 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. 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. |
| J | Supplied without bracket. |
| (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. |
| 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) |
Feeding a plant-air branch that supplies a pneumatic press: the 5 um element strips water and fine particulate before the air reaches the press valves, while the regulator holds a steady working pressure and the check valve holds it if supply dips.
Conditioning the 1/2 in air drop that runs a packaging conveyor's cylinder bank - filtered, regulated air to the directional valves, with the bar gauge letting operators verify set pressure at a glance during changeovers.
Supplying clean, regulated air to laboratory automation equipment where the finer 5 um grade protects sensitive pneumatic actuators and the manual drain suits a supervised, non-freezing environment.
Size 400 with a 1/2 in port sits in the upper half of the GFR range; step up to 600 or down to 300 depending on the flow your line needs - we will confirm the curve against your demand before you order. This unit carries the 5 um W element; choose 40 um for general protection or 5 um where finer filtration matters. The manual drain suits attended installations where an operator can bleed the bowl; automatic or differential-pressure drain is available if the unit sits unattended. The square gauge here reads bar; MPa and psi scales are also offered. NPT is specified on this code; PT and G are order options. No mounting bracket is included with the J code.
Flow for this family is published as curves, not a single rated figure, so send us your application details 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 figure, so we do not quote a number here. Send us your application's flow demand and we will confirm the sizing from the datasheet on request before you order.
The M code means the PC bowl is drained by hand, which suits installations where an operator is present regularly; automatic and differential-pressure drain versions are available for unattended lines. The W code fits the 5 um element instead of the 40 um standard, giving finer particulate and water removal for more demanding downstream equipment.
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.