The AirTAC GFR400-10 AirTAC Filter Regulator 3/8 in 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 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 GFR400-10 is a size 400 filter regulator that removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration is the low-pressure type with a 5 um filter element (the finer of the two published grades), a manual drain on the PC bowl, an embedded square gauge reading in psi, and a reverse/check valve fitted. It connects at PT3/8 (3/8 in) and carries a maximum inlet pressure of 1.0 MPa (145 psi), with an operating temperature of -5 to 70 C (non-freezing). A mounting bracket is included.
This is a genuine AirTAC part from the GFR filter-regulator line, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of drain types, 40 um or 5 um filtration, gauge scales in MPa, psi or bar, 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 ordering.
| Model | GFR400-10 AirTAC Filter Regulator 3/8 in Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (PT thread) |
| Filtering grade | 5 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. |
| 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. |
| 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) |
On fixture clamping circuits that hold at reduced pressure rather than full line pressure, this low-pressure type filter regulator conditions the air to 5 um and sets the clamp pressure locally, with the check valve holding the circuit if supply drops.
Machine tool builders use a 3/8 in filter regulator ahead of tool-change cylinders and clamping valves; the 5 um element protects directional valves from particulate and the psi gauge gives operators a readable setpoint.
On packaging machines where sealing and transfer cylinders run at moderate pressures, this unit filters water and fine dirt from the shop air and regulates the supply to the actuator bank, with manual drain suited to scheduled end-of-shift checks.
Choose the size and port step against the airflow your line needs: this unit is size 400 with a 3/8 in PT port, one step up from the 1/4 in size 300. The 5 um element suits downstream equipment that needs finer filtration than the 40 um standard; the manual drain means an operator opens the bowl drain during checks rather than relying on automatic or differential-pressure action. The square gauge is set to the psi scale (MPa and bar scales are available), and the fitted reverse/check valve holds downstream pressure if the supply is interrupted. Thread is PT as standard; G (BSPP) and NPT are catalogue options to order. Flow is published as curves, not a single rating, so send us your application details and we will confirm sizing against 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 curves, not as a single rated figure, so we do not quote a number here. Tell us your application and we will confirm the relevant flow and datasheet figures for this size 400, 3/8 in unit on request before you order.
The L in the code marks the low-pressure regulator type, intended for circuits set below the standard range. The exact adjustment range for the low-pressure type is not published on our sheet, so ask us to confirm it on request; the 5 um element, manual drain, psi gauge and check valve in this configuration are all confirmed from the 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.