The AirTAC GFR400-15 AirTAC Filter Regulator PT1/2 with Round Gauge 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 differential-pressure drain and regulates 0.15 - 0.9 MPa (20 - 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: one body that removes water and particulate from compressed air and holds downstream pressure steady. This size 400 unit takes a PT1/2 (1/2 in) thread, carries a 40 um standard filter element, and drains condensate by differential pressure, so the bowl empties itself as flow demand rises. The standard regulator adjusts from 0.15-0.9 MPa (20-130 psi), the fitted round gauge reads in psi, and the K code means a reverse/check valve is fitted to hold downstream pressure if the supply drops. The bowl on this size is polycarbonate (PC), and the mounting bracket is included.
This is a genuine AirTAC part from the GFR range, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, optional 5 um elements (code W), automatic or manual drains, G or NPT threads, and MPa, psi or bar gauge scales. Flow figures for this series are published as curves rather than a single rating, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR400-15 AirTAC Filter Regulator PT1/2 with Round Gauge |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (PT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 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 | Differential-pressure 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 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". |
| (blank) | Drain: Differential-pressure drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 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. |
| 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. |
| (blank) | PT 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 clean, regulated air to the tool-change clamps and pneumatic actuators on a machining cell, with the check valve holding clamp pressure if the shop supply dips mid-cycle.
Conditions the air feeding conveyor diverters, bag sealers and case-erector cylinders on a packaging line, keeping water and scale out of the valves that index the line.
A point-of-use filter regulator on the 1/2 in drop feeding an assembly bench, so torque tools, clamps and air tables each get air filtered to 40 um at the pressure the station is set to.
Size 400 with a 1/2 in PT port suits lines with substantial air demand; if your consumption is modest, the 300 or 200 step costs less and fits tighter panels. Choose the drain to match access: differential-pressure (this unit) self-drains with flow, automatic (A) empties on a cycle, manual (M) needs someone to open the valve. The 40 um element is the standard choice for general plant air; specify 5 um (W) only where downstream equipment needs finer filtration. Gauge scale is your call - this unit ships with a round psi gauge, and MPa or bar scales are available. PT is the standard thread; G (BSPP) and NPT are order options, so confirm the thread your pipework expects before ordering. Bracket is included on this size.
One honest note on sizing: AirTAC publishes flow for this series as curves, not a single rated figure, so we cannot quote you a rated flow number. Send us your required flow and line conditions and we will confirm the right size 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 performance curves, not a single rated number, so we do not quote a rated flow, Cv or SCFM figure. Send us your required flow and operating pressure and we will confirm the correct size from the datasheet on request before you order.
K means a reverse/check valve is fitted, so downstream pressure is held if the upstream supply is lost. C2 is the gauge code: an external round gauge reading in psi (scales 1, 2 and 3 correspond to MPa, psi and bar). The drain is differential-pressure (blank code) and the filter grade is the 40 um standard (W would be 5 um).
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.