The AirTAC GFR300-08LJNWTK AirTAC Filter Regulator NPT1/4 5um 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 PT1/4" 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 GFR300-08LJNWTK is a 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the low-pressure type, fitted with a fine 5 um filter element (code W), a differential-pressure drain that bleeds collected condensate automatically as flow passes through, and a built-in reverse/check valve that holds downstream pressure when the upstream supply is lost. It has a 1/4 in NPT port, no gauge fitted and no mounting bracket, so mount it on the connected pipework or a customer-supplied bracket and add a separate gauge if your process needs a local pressure reading.
This is a genuine AirTAC part from the GFR300 series, one size within the GFR range that spans 200, 300, 400 and 600 body sizes with port options from 1/8 in to 1 in and PT, G or NPT threads. The PC (polycarbonate) bowl suits the 300 size, and rated flow for this series is published as curves rather than a single figure, so ask us to confirm flow and datasheet details for your application before ordering.
| Model | GFR300-08LJNWTK AirTAC Filter Regulator NPT1/4 5um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (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.
| GFR300 | G-series filter regulator, 300 body — sets the port range. |
|---|---|
| 08 | Port size PT1/4". 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. |
| 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 | GFR300 · PT1/4" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeds filtered, regulated air to the gripper actuators on a robotic pick-and-place cell that runs at reduced pressure, with the 5 um element protecting the gripper valves and the check valve holding the grip if the supply drops.
Supplies clean, regulated low-pressure air to the diverter and gate cylinders along a parcel-sorting conveyor, where the differential-pressure drain keeps condensate from accumulating during continuous running.
Conditions the compressed-air supply to a laboratory sample-handling bench that operates below standard line pressure, with fine 5 um filtration safeguarding the bench's pneumatic components and the check valve isolating the bench from supply dips.
Choose the GFR300 size when your line sits in the mid-range of the family: 200, 300, 400 and 600 step up in port and flow capacity, and this unit carries a 1/4 in NPT port. The 5 um element (code W) is the finer of the two published grades, the other being the 40 um standard, so pick W where downstream valves and actuators need cleaner air. The differential-pressure drain is the default and needs no operator action; automatic and manual drains are the alternatives in the family if your duty cycle suits them. Threads are PT as standard with G and NPT as order options, and brackets are optional on this family. Because flow for this series is published as curves rather than a single rating, 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR300 series as curves, not as a single rated figure, so we do not quote a number here. Tell us your application and we will confirm the flow from the datasheet on request before you order.
The N in the code means no gauge is fitted; you can add a separate gauge if you want a local pressure reading. The L in the code marks the low-pressure regulator type, which regulates below the standard GFR range; the exact range for this variant is not published in our sheet, so confirm it with us 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.