The AirTAC AirTAC GFR300-10LJNWT Filter Regulator NPT3/8, 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 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 GFR300-10LJNWT is a filter regulator: one body that removes water and particulate from compressed air and then regulates downstream pressure. This 300-size unit is ordered with an NPT3/8 (3/8 in) port, the fine 5 um filter element (code W), and a differential-pressure drain that bleeds collected condensate automatically whenever the pressure differential across the bowl is high enough. It is the low-pressure (L) type, and it is ordered without a gauge (code N) and without a mounting bracket (code J). Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing). The bowl on this 300 size is polycarbonate (PC).
This is a genuine AirTAC part. The GFR family is available in 200, 300, 400 and 600 sizes with ports from 1/8 in to 1 in, a choice of 40 um standard or 5 um fine filtration, differential-pressure, automatic or manual drains, gauge options, and PT (standard), G or NPT threads. Flow for this series is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application before ordering.
| Model | AirTAC GFR300-10LJNWT Filter Regulator NPT3/8, 5 um |
|---|---|
| Series | GFR300 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 | Not fitted |
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.
| GFR300 | G-series filter regulator, 300 body — sets the port range. |
|---|---|
| 10 | Port size PT3/8". This body offers 08 = PT1/4", 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. |
| 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. |
| 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. |
| (blank) | No reverse-flow valve (the default). |
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 | GFR300 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
On a carton-sealing or case-packing line, filtered and regulated air feeds the clamping cylinders that hold boxes during taping. The 5 um element keeps fine particulate out of the valve spools, and the low-pressure type suits circuits running below standard regulator settings.
In a paint or coating booth, the 5 um element strips water and fine dirt that would otherwise cause fisheyes and surface defects, while the regulator holds a steady gun pressure. The differential-pressure drain sheds collected condensate as air flows.
On an assembly cell with pneumatic grippers and rotary actuators, this unit filters the plant air and holds a fixed, repeatable pressure so cycle positions stay consistent. The NPT3/8 port fits the cell's drop lines without adapters.
Start with the port and size: GFR300 covers a 3/8 in NPT connection, and the next step up or down in the 200/300/400/600 ladder changes both the port and the flow capacity - match the size to the air demand of the circuit rather than to the pipe alone. Choose the drain: differential-pressure (this unit) drains automatically with flow, an automatic drain (code A) empties the bowl on a timer-free basis, and a manual drain (code M) requires someone to open it. Choose the element: 40 um is the standard grade and 5 um (code W, fitted here) suits finer downstream equipment. If your working pressure is below the standard regulator range, the low-pressure (L) type is the correct variant - its exact adjustment range is not published, so confirm it with us. Gauges (round or square, MPa/psi/bar scales), brackets, and PT vs G vs NPT threads are all order options; this unit was ordered with none of the gauge or bracket options and with NPT thread. Flow is published as curves, not a single rating, so ask us to confirm sizing against your application before ordering.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. Without the K option, air cannot flow back 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 there is no one l/min or SCFM number we can quote. Send us your application's air demand and working pressure and we will confirm the correct size from the datasheet curves before you order.
L marks the low-pressure type of the GFR regulator. It is intended for circuits where the required downstream pressure is below what the standard type is set up for; the exact adjustment range for the low-pressure type is not published, so confirm it with us. This unit also carries N (no gauge fitted), so you will need a separate gauge to read the outlet pressure, or you can reorder with a gauge option.
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.