The AirTAC GFR400-10 AirTAC Filter Regulator 3/8" NPT 5 um Auto 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 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 steady in a single body. This unit sits on the size-400 platform with a 3/8 in NPT port, the finer 5 um filter element, an automatic drain, and the low-pressure regulator type. A round gauge reading in psi is fitted, a reverse/check valve is included, and the unit is supplied without a mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drains, 40 um or 5 um filtration, standard or low-pressure regulation, gauge options, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before you order.
| Model | GFR400-10 AirTAC Filter Regulator 3/8" NPT 5 um Auto Drain |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT 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 — 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. |
|---|---|
| 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). |
| C | Gauge shape: Round. 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. |
| 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 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Air-assisted spray and coating setups often run below standard regulator ranges. This low-pressure filter regulator keeps atomising air steady while the 5 um element stops scale and rust reaching the gun.
Fixture and clamp cylinders on a CNC cell need clean, steady air. This unit filters to 5 um and regulates the clamping circuit, with the fitted check valve helping hold the circuit if upstream pressure dips.
Cylinder-driven diverters, pushers and gating on a packaging line get water- and particle-free air at a set pressure, while the automatic drain clears condensate without daily manual attention.
Every meaningful choice on this unit is visible in the code. Size 400 with a 3/8 in NPT port suits circuits plumbed at 3/8 in; step up or down a size if your air demand differs, and we will check it against the published flow curves. The 5 um element (code W) is the finer option versus the standard 40 um - choose it where downstream valves and instruments are sensitive to carryover. The automatic drain (code A) ejects collected condensate without daily attention, unlike the differential-pressure default or a manual drain. The low-pressure type (code L) regulates below the standard adjustment range; the exact range for this variant is not published, so confirm it with us. The round gauge reads in psi, while an embedded square gauge with MPa or bar scales is the alternative. Thread here is NPT; PT is the standard and G is also orderable. No mounting bracket is included (code J), and a reverse/check valve is fitted (code K).
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 this family as curves rather than a single rated figure, so we do not quote a number. Send us your application details and we will confirm the datasheet flow curve and sizing before you order.
Code L marks the low-pressure regulator type, intended for circuits that run below the standard adjustment range. The exact range for this variant is not published, so please confirm it with us. The rest of the decode is a 5 um element, automatic drain, round psi gauge, reverse/check valve fitted, and no mounting bracket.
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.