The AirTAC GFR400-15 AirTAC Filter Regulator NPT1/2 5um Manual Drain 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 sets downstream pressure in a single body, so one 1/2-inch (NPT1/2) connection does both jobs. This configuration carries the 5 um filter element (code W) for finer particle capture than the 40 um standard, a manual drain you operate by hand to empty collected condensate from the polycarbonate bowl, and a round pressure gauge reading in bar. It is a standard-type regulator with a mounting bracket included.
This is a genuine AirTAC part in the GFR400 size class. The GFR family spans sizes 200, 300, 400 and 600 with a choice of PT, G (BSPP) or NPT threads, 40 um or 5 um filtration, and differential-pressure, automatic or manual drains. Maximum inlet pressure is 1.0 MPa (145 psi), the working temperature range is -5 to 70 C (non-freezing), and the regulation range with manual drain is 0.05-0.9 MPa (7-130 psi). Flow is published as curves rather than a single rating, so we confirm datasheet figures on request.
| Model | GFR400-15 AirTAC Filter Regulator NPT1/2 5um Manual Drain |
|---|---|
| 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 — round, bar scale |
| Reflux valve | Not fitted |
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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. 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. |
| (blank) | No reverse-flow valve (the default). |
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 the air cylinders and clamps on a punch press from a 1/2-inch main: the GFR400-15 strips water and chips-carried particulate to 5 um and holds a steady set pressure so stroke timing stays consistent through the shift.
Regulating and filtering the air feeding conveyor diverters, case erectors and bagger cylinders, where the manual drain is emptied during scheduled changeovers and the bar gauge gives operators a visible setpoint.
Supplying filtered, regulated air to workholding clamps and tool-change cylinders on a machining centre, where the 5 um element helps protect sensitive pilot valves downstream of the 1/2-inch drop.
Size 400 with a 1/2-inch port sits in the upper-middle of the GFR range: step up to 600 or down to 300 depending on the flow your line needs - we will check the published flow curve against your application before you order. Drain choice matters: manual (this unit) is emptied by hand and suits installations under regular supervision; automatic and differential-pressure drains suit unattended duty, and the manual-drain version also widens the regulation range down to 0.05 MPa (7 psi). The 5 um element (W) is the right pick where finer particulate matters; the 40 um standard element is adequate for general supply. Gauge options are the embedded square gauge or an external round gauge, with MPa, psi or bar scales - this unit has a round gauge in bar. Thread is NPT here; PT is the standard and G (BSPP) is also a catalogue option. A mounting bracket is included.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. Without the K option, air cannot flow back through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR400 as curves, not as a single rated number, so we do not quote a figure. Send us your application details and we will confirm the flow data from the datasheet so you can size the unit correctly before ordering.
The manual drain (code M) means you empty collected condensate from the bowl by hand, which suits installations checked during normal maintenance rounds. It also gives a wider regulation range of 0.05-0.9 MPa (7-130 psi), compared with 0.15-0.9 MPa (20-130 psi) on the automatic and differential-pressure drain versions. Automatic or differential-pressure drain variants are available if the unit will run unattended.
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.