The AirTAC GFR40010LNWTK AirTAC Filter Regulator NPT3/8 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 differential-pressure 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 GFR40010LNWTK is a size 400 filter regulator: one body that removes water and particulate from compressed air and then regulates downstream pressure. This configuration is built on 3/8 in NPT ports and is the low-pressure (L) regulation type, suited to circuits that hold a lower working pressure than a standard unit targets. It carries the fine 5 um (W) filter element, a differential-pressure drain that bleeds collected condensate as flow passes through, and an integrated reverse/check valve that holds downstream pressure when the upstream supply is lost. No gauge is fitted (code N) and a mounting bracket is included. The polycarbonate bowl lets you see the condensate level at a glance.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drains, 40 um standard or 5 um fine filtration, and PT, G or NPT threads. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing). Because published flow data appears as curves rather than a single rating, we confirm the exact figures and datasheet details for your application on request.
| Model | GFR40010LNWTK AirTAC Filter Regulator NPT3/8 Low-Pressure |
|---|---|
| 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 | Differential-pressure 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". |
| (blank) | Drain: Differential-pressure 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. |
| 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) |
Spray guns and atomising nozzles on finishing lines run at deliberately low regulated pressures for finish quality. This low-pressure-type filter regulator cleans the air to 5 um, drops the line to the gun's working pressure, and the check valve keeps the setting stable if the supply dips mid-shift.
Carton sealers, case erectors and labelling heads on a packaging line need clean, moisture-free air at a steady reduced pressure so cylinders stroke consistently. A single GFR body does both jobs at the 3/8 in feed, and the differential-pressure drain clears condensate during normal production flow.
Clamp cylinders on CNC fixtures lose holding force when air pressure drifts. Feeding them through this unit filters cutting-atmosphere contamination down to 5 um, regulates the clamp circuit at its low working pressure, and the reverse/check valve holds the clamp if the shop air drops.
Start with the port and size step: this unit is size 400 with 3/8 in NPT ports, one step up from the 300 series, so choose it when your line's flow demand sits above what a 1/4 in unit comfortably serves. The low-pressure (L) regulation type is the key decode here - it targets lower regulated pressures than the standard type, and since the exact range is not published we will confirm it against your setpoint before you order. Filtration is the 5 um (W) element; the standard grade is 40 um, so pick 5 um where downstream valves or instruments need finer air. The drain is differential-pressure, which discharges condensate in response to flow; if your compressor cycles lightly or the unit sits in an inaccessible spot, ask about the automatic or manual drain variants instead.
Other choices to weigh: no gauge is fitted on this code, but gauge options exist if you want a visual setpoint reference; NPT is the thread here while PT (standard) and G are orderable alternatives; and the bracket is included for panel or wall mounting. Flow is published as curves, not a single rated figure, so send us your application details and we will confirm sizing 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 performance curves rather than a single rated figure, so there is no one number we can honestly quote. Tell us your operating pressure and air demand and we will confirm the sizing from the datasheet curves on request before you order.
The N in the code means no gauge is fitted, so you add your own downstream gauge or order a gauge-equipped variant if you want a visual reference. The L in the code marks the low-pressure regulation type, intended for circuits held at lower pressures than the standard type; the exact adjustment range for this variant is not published in the material we hold, so we confirm it against your setpoint on request.
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.