The AirTAC AirTAC GFR400-10 Filter Regulator PT3/8 Low-Pressure 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 PT3/8" 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 GFR400-10 is an AirTAC GFR400 filter regulator: filtration and pressure regulation combined in a single body, sized for 3/8 in (PT3/8) piping. This configuration is the low-pressure type, so the regulated output is intended for circuits that run below standard plant pressure. It carries a manual-drain bowl in polycarbonate, a 40 um standard filter element for water and particulate removal, an embedded square gauge reading in psi, and a built-in reverse (check) valve; a mounting bracket is included.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, drain choices (differential-pressure, automatic or manual), a 5 um optional element (code W), and gauge scale options. Flow is published as curves rather than a single rated figure, so we confirm the datasheet and flow figures for your application on request.
| Model | AirTAC GFR400-10 Filter Regulator PT3/8 Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (PT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 130 psi)). |
| L | Low-pressure type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (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. |
| (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 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
On a bottling or canning conveyor, low-pressure air knives strip rinse water before labelling. This filter regulator cleans the supply, holds a gentle set pressure so labels and coatings are not disturbed, and the check valve keeps the setting stable when upstream flow dips.
Test benches and lab rigs often need a clean, low-pressure air feed for purging vessels, cooling sensors or actuating light fixtures. The 40 um element removes water and debris, the psi gauge gives a direct readout, and the manual drain suits supervised bench work.
Loom and spinning-machine air circuits use low-pressure jets for threading, cleaning and doffing. This unit filters the mill air supply and regulates it down to the gentle working pressure those jets need, with the bracket allowing panel or frame mounting beside the machine.
Start with the port step: this unit is the size 400 body with a 3/8 in PT thread, so match it to your line size and the flow your circuit needs - larger sizes carry larger ports and more flow. Because flow is published as curves, not a single rating, ask us to confirm sizing against your application before ordering. The manual drain means an operator opens the bowl drain periodically, which suits attended stations; automatic or differential-pressure drains are available in the family if you prefer unattended condensate removal. The 40 um element is the standard grade; specify code W for the 5 um option where finer filtration is needed. The square gauge here reads in psi (MPa and bar scales are alternatives), and PT is the standard thread with G (BSPP) and NPT available as order options.
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 rather than a single rated figure, so we do not quote one number. Tell us your line size and application and we will confirm the flow figures from the datasheet on request before you order.
The M in the code means the bowl drain is opened by hand, which suits stations where someone is present to bleed condensate; automatic and differential-pressure drains are available in the family for unattended duty. The L code marks the low-pressure regulator type, intended for circuits regulated below standard plant pressure - ask us to confirm its exact range from the datasheet.
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.