The AirTAC GFR30008LJF3WTK AirTAC Filter Regulator NPT1/4 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 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 GFR30008LJF3WTK is a GFR300 filter regulator: one body that removes water and particulate from compressed air and regulates downstream pressure. This configuration is the 300 size with a 1/4 in NPT port, fitted with a 5 um filter element (code W) for finer filtration than the standard 40 um grade, a differential-pressure drain that bleeds collected condensate when the pressure differential across the element rises, and a reverse/check valve (code K) that holds downstream pressure when the upstream supply is lost. It is the low-pressure type (code L), intended where regulated pressure must sit below the standard regulator range. The square gauge is fitted and reads in bar, and this unit comes without a mounting bracket. The polycarbonate bowl suits the 300 size; only the 600 size uses an aluminium alloy bowl.
This is a genuine AirTAC part. The GFR filter-regulator family spans the 200, 300, 400 and 600 sizes, with port options from 1/8 in to 1 in, PT as the standard thread and G or NPT as order options, drain choices of differential-pressure, automatic or manual, 40 um or 5 um filtration, and gauge scales in MPa, psi or bar. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and flow curve for this exact model before ordering.
| Model | GFR30008LJF3WTK AirTAC Filter Regulator NPT1/4 Low-Pressure |
|---|---|
| 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 | Fitted — square, bar scale |
| 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. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. C is round, F is square. |
| 3 | Gauge scale: bar. 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) |
On a machine-tool press or fixture-clamping circuit, this unit cleans the supply air to 5 um and holds a steady low regulated pressure to the clamping valves, with the check valve holding the clamp circuit if upstream air drops.
On a carton-sealing or wrapping line, the filter-regulator sits at the machine drop to strip water and fine particulate before the air cylinders and the low-pressure setting suits delicate sealing actuation.
On a test bench or lab rig fed from a shop-air header, the 5 um element protects sensitive instruments and the low-pressure regulator type allows gentle, repeatable supply pressures, read directly on the bar-scale gauge.
Start with the size and port: the GFR300 steps up from the 200 series with a larger 1/4 in port, and the right size depends on the flow your line needs - we can check the published flow curve against your demand before you order. For filtration, this model carries the 5 um element (code W); the standard grade is 40 um, so choose 5 um where downstream valves and cylinders need finer protection. The differential-pressure drain on this unit is the default choice for steady-running installations; automatic (A) and manual (M) drains are available in the family if your duty cycle or access differs. The low-pressure type (L) is the correct pick when your set pressure sits below the standard regulator range - the exact range for this type is not published, so confirm it with us. Gauge scale is bar here; MPa and psi scales are alternatives. Thread is NPT on this model, with PT as the catalogue standard and G available; bracket options apply per code. Because flow is published as curves, not 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 GFR series as curves, not as a single rated figure, so we do not quote a number. Tell us your application and we will confirm the flow curve and sizing for this exact model from the datasheet on request.
The L code marks the low-pressure regulator type, intended for set pressures below the standard GFR range. The exact adjustment range for the low-pressure type is not published in the material we hold, so confirm your target set pressure with us and we will verify suitability from the datasheet before you order.
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.