The AirTAC GFR400-10 AirTAC Filter Regulator 3/8" Low-Pressure 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 PT3/8" ports, a automatic 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 GFR400-10 is a filter regulator: it removes water and particulate from compressed air and holds downstream pressure in one body. This configuration is the 400 size with a 3/8 in PT port, the 5 um filter element (code W), an automatic drain that empties the PC bowl without manual attention, and the embedded square gauge fitted with a psi scale. It is the low-pressure type, intended for circuits that run at reduced supply pressure, and it has no mounting bracket on this code.
This is a genuine AirTAC part. The GFR series spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and options include 40 um or 5 um filtration, differential-pressure, automatic or manual drains, MPa, psi or bar gauge scales, G or NPT threads, and a mounting bracket. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application.
| Model | GFR400-10 AirTAC Filter Regulator 3/8" Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (PT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, psi 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. 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. |
|---|---|
| 10 | Port size PT3/8". This body offers 10 = PT3/8", 15 = PT1/2". |
| A | Drain: Automatic drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 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. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Pneumatic clamp cylinders on an assembly fixture often need a holding pressure well below the main shop supply. This filter regulator cleans the air feeding the clamps, holds the reduced setting steady through the shift, and its automatic drain keeps condensate out of the fixture circuit without an operator visiting the panel.
Solenoid and pilot-operated process valves need clean, dry air at a stable reduced pressure to shift reliably. Mounted at the pilot-air takeoff, this unit filters to 5 um ahead of the pilots, regulates the low pilot pressure, and the psi gauge gives technicians a direct readout during commissioning.
Packaging conveyors and carton-forming stations run many small cylinders and air valves that suffer from water and fine debris in the supply. A 5 um element plus regulation at the drop protects that hardware, and the automatic drain handles condensate on lines that run unattended across shifts.
Size and port step up with demand: 200/300/400/600 with ports from 1/8 to 1 in, so pick the step that matches your air consumption - we can check the published flow curves against your requirement before you order. This unit carries the 5 um element (choose 40 um for general-duty air, 5 um where finer protection matters), an automatic drain (manual and differential-pressure drains are the alternatives), and a square psi gauge (MPa or bar scales, or an external round gauge, are options). Thread is PT as standard; G (BSPP) and NPT are order options. The low-pressure type suits circuits running below the standard regulator band - confirm the exact adjustment range with us. No bracket is fitted on this code.
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 GFR series as curves, not a single rated figure, so we do not quote a number here. Send us your line pressure, required downstream pressure and air demand, and we will confirm the sizing from the datasheet before you order.
The automatic drain (code A) expels collected condensate on its own, which suits unmanned or hard-to-reach installations; manual and differential-pressure drains are the other catalogue choices. The 5 um element (code W) gives finer particulate protection than the 40 um standard element, which matters ahead of precision valves and cylinders. Both are decode choices built into this 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.