The AirTAC GFR400-10 AirTAC Filter Regulator NPT 3/8 in, 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 AirTAC GFR400-10 is a filter regulator: it removes water and particulate from compressed air and reduces pressure in a single body. This unit is built for a 3/8 in NPT port, carries a 40 um filter element, and drains by hand through its manual drain on the polycarbonate bowl. It is the low-pressure type, and a built-in check (reverse) valve holds downstream pressure when the supply line is vented or lost. No gauge is fitted and no mounting bracket is included.
This is a genuine AirTAC part from the GFR400 series within the G-series range, which spans sizes 200, 300, 400 and 600 with PT, G and NPT thread options, drain choices, and 40 um or 5 um filtration. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing). The exact regulation range of the low-pressure type is not published; we confirm flow and datasheet figures on request.
| Model | GFR400-10 AirTAC Filter Regulator NPT 3/8 in, Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT 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 | Not fitted |
| 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. |
| J | Supplied without bracket. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 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" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Filtered, reduced-pressure air for clamping cylinders on a carton-sealing line; the built-in check valve holds the clamp position if the main supply drops.
Low-pressure regulation for pneumatic grippers on an assembly cell, with 40 um filtration protecting the gripper valves from water and debris.
A manual-drain filter regulator on a test bench where an operator drains the bowl between runs and sets a low, stable test pressure by hand.
Choose the 400 size with a 3/8 in port when your line runs at that pipe size; larger sizes carry more flow, and AirTAC publishes flow as curves rather than a single rating, so ask us to confirm sizing against your application before ordering. The remaining choices are already fixed in this code: manual drain (you empty the bowl by hand), 40 um filtration (5 um is available as code W), low-pressure regulation, a check valve, no gauge and no bracket. Thread is NPT here; PT is the standard and G is orderable. If you want a pressure readout, order a gauge variant.
If your circuit must hold pressure through a supply interruption, the fitted check valve does that job; if you would rather never think about draining, the automatic-drain version is the alternative to this manual-drain unit.
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 series as curves, not as a single rated figure, so we do not quote a number here. Send us your line pressure and air demand and we will confirm the flow from the datasheet on request.
The M in the code sets a manual drain: an operator opens it to empty collected water, which suits duties with regular maintenance stops. The K adds a check valve that holds downstream pressure if the inlet supply is lost. If you prefer automatic draining, ask for the A version.
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.