The AirTAC GFR400-15L AirTAC Filter Regulator NPT1/2, 5 um 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 PT1/2" 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 GFR400-15L is a size 400 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration carries a 1/2 in NPT port, a 5 um filter element (code W, finer than the 40 um standard), a differential-pressure drain that bleeds collected condensate automatically when the pressure differential across the element rises, and a built-in reverse/check valve that holds downstream pressure if the supply is lost. It is the low-pressure (L) type, is supplied without a gauge, and includes a mounting bracket. The polycarbonate bowl lets you see the condensate level at a glance.
This is a genuine AirTAC part. The GFR filter-regulator family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drains, 40 um or 5 um elements, gauge options and PT, G or NPT threads. Rated inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing). Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application.
| Model | GFR400-15L AirTAC Filter Regulator NPT1/2, 5 um |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (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. |
|---|---|
| 15 | Port size PT1/2". 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 · PT1/2" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
A filter regulator feeding clamp cylinders on a CNC fixture line: the 5 um element keeps scale and pipe debris out of the clamp valves, the check valve holds clamp pressure if the shop air drops, and the low-pressure type suits circuits run well below full line pressure.
Feeding spray guns and air-assisted applicators in a finishing booth, where water and fine particulate in the supply ruin finish quality. The differential-pressure drain keeps condensate moving out of the bowl during long spray runs without an operator opening a drain.
Regulating and cleaning air to grippers and diverters on a carton packaging line. The bracket-mounted unit sits in the machine's air preparation section, and the check valve keeps actuators from collapsing when the main supply is isolated for changeover.
Start with the port step: size 400 with a 1/2 in NPT port suits lines running higher air demand than the 200/300 sizes; step up to size 600 if your circuit needs the largest ports. Choose the filter grade for the job: 40 um is the standard general-purpose element, while the 5 um (W) fitted here is the finer option for sensitive downstream equipment. Pick the drain to match maintenance access: differential-pressure (fitted here) drains on load, automatic drains on a cycle, and manual suits attended installations. If you need a pressure readout, order a gauge variant - this unit ships without one. PT is the standard thread; G and NPT are order options, as NPT is here. The mounting bracket is included.
One honest note on sizing: AirTAC publishes flow for this family as curves, not a single rated figure, and the exact regulation range of the low-pressure type is not stated in the material we hold. Tell us your line pressure and demand and we will confirm the 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 family as curves rather than a single rated figure, and the exact regulation range of the low-pressure (L) type is not stated in the catalogue material we hold, so we will not quote a number we cannot back up. Send us your line pressure, required downstream pressure and air demand, and we will confirm the sizing and the datasheet figures for this specific unit before you order.
The N in the code means no gauge is fitted, so this unit regulates without a local pressure readout. If your application needs one, order the gauge variant of the GFR400 in 1/2 in instead: gauge versions use an embedded square gauge, with an external round gauge available as an option, and you can choose an MPa, psi or bar scale. Tell us which scale your operators work in and we will confirm the right ordering 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.