The AirTAC GFR400-10ALNTK AirTAC Filter Regulator 3/8 in NPT 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 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 GFR400-10ALNTK is an AirTAC GFR-series filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This 400-size unit is fitted with a 3/8 in NPT port, a 40 um standard filter element, an automatic drain that expels collected condensate without manual attention, and a reverse/check valve. It is the low-pressure (L) type regulator, and no gauge is fitted (code N); a bracket is included for mounting.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with a choice of ports, threads (PT standard, G and NPT as options), drain types, 40 um or 5 um filtration, gauge options and standard or low-pressure regulation. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application on request.
| Model | GFR400-10ALNTK AirTAC Filter Regulator 3/8 in NPT |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 40 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 | 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". |
| 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. |
| (blank) | Mounting bracket included. |
| 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) |
Air-prep point for clamps and fixtures on a CNC machining cell: the filter stage strips water and chips-laden particulate before it reaches the clamp cylinders, while the low-pressure regulator holds the clamping circuit at the gentler setting those actuators are set up for.
Feeding carton sealers, labellers and wrap stations on a packaging line: the 3/8 in NPT port suits the machine's supply drop, the automatic drain keeps condensate out of the valves during shifts without an operator stopping to drain a bowl, and the check valve holds the downstream setting if supply dips.
Supplying bench apparatus, spray checks or test rigs that run at reduced pressure: the low-pressure type regulator gives finer control in the lower part of the range, and the 40 um element protects sensitive instruments and fittings from water and debris in the shop air.
Choose the size and port step against the air demand of the circuit - the 400 size with its 3/8 in NPT port sits in the middle of the GFR range, one step up from 300 and one below 600. This unit combines the automatic drain (no daily manual draining needed) with the 40 um standard element; the 5 um (W) element is the choice where finer particulate removal matters. Note this is the low-pressure (L) regulator type, intended where the working pressure is set below the standard type's range - the exact range for this variant is not published, so confirm it with us before ordering. No gauge is fitted on this code; gauge options exist elsewhere in the family if you need a visual setpoint. PT is the standard thread, with G and NPT as order options - this code specifies NPT. A mounting bracket is included.
Flow for this family is published as curves, not a single rating, so send us your application details and we will confirm sizing from 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 family as curves, not as a single rated number, so there is no one figure we can honestly quote. Tell us your application and required flow, and we will confirm the sizing from the datasheet on request before you order.
L marks the low-pressure type regulator: this unit is built for circuits where the working pressure is set below the standard type's range. The exact range for this variant is not published, so confirm it with us on request. The N in the code means no gauge is fitted; gauge options are available on other GFR codes if you need a visual pressure indication.
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.