The AirTAC GFR30008LJNT AirTAC Filter Regulator NPT1/4 Low-Pressure is a genuine G-series filter regulator: water separation, 40 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 GFR30008LJNT is an AirTAC GFR300 filter regulator: filtration and pressure regulation combined in a single body. It removes water and particulate from compressed air through a 40 um element and holds a set downstream pressure, in a low-pressure configuration. This unit is fitted with 1/4 in NPT ports, a differential-pressure drain that bleeds collected condensate automatically as flow passes through, and no pressure gauge, mounting bracket or reverse/check valve. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl keeps the condensate level visible at a glance.
This is a genuine AirTAC part. The GFR series is available in sizes 200, 300, 400 and 600 with a choice of ports, PT, G or NPT threads, differential-pressure, automatic or manual drains, a 5 um (code W) element option, gauge and bracket options, and standard or low-pressure regulation. Flow 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 | GFR30008LJNT AirTAC Filter Regulator NPT1/4 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 40 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. |
|---|---|
| 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. |
| (blank) | Filtering grade 40 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 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Filtering and regulating the shop-air feed to a CNC machine's pneumatic clamps and tool-change circuits, with the 40 um element keeping particulate out of the valves and the low-pressure setting matched to the machine's actuation requirements.
Conditioning the air feeding cylinders and diverters on a carton packaging conveyor, where the differential-pressure drain clears condensate during production and the regulator holds a steady pressure so cylinder strokes stay repeatable.
Serving a branch air drop in a textile mill that runs at modest regulated pressures, where the low-pressure GFR variant suits the equipment and the polycarbonate bowl lets operators see collected water during the shift.
Sizing starts with the port and size step: this unit is size 300 with 1/4 in NPT ports; step up to size 400 or 600 if your line may need more flow later, since flow capacity rises with size. The 40 um element suits general plant air; choose the 5 um (W) version where downstream valves or instruments need finer filtration. Drain choice matters: the differential-pressure drain fitted here needs a minimum flow to purge, while an automatic (A) or manual (M) drain suits low-flow or intermittently used lines. This is the low-pressure (L) type, so confirm its regulation range against your set pressure before ordering; the exact range for this variant is not published and we will confirm it on request.
Other decodable choices: no gauge is fitted (code N), so add a gauge variant if you need to read the regulated pressure; no bracket is included (code J); and thread alternatives are PT (standard) and G, orderable as catalogue options. Because flow is published as curves and not a single rating, send us your application details and we will confirm sizing against the datasheet before you order.
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 rather than a single rated figure, so we do not quote a rated flow, Cv or SCFM number. Send us your line pressure, set pressure and expected air demand, and we will confirm the sizing against the datasheet before you order.
The N in GFR30008LJNT means no pressure gauge is fitted; gauge variants with different dial scales are available in the series if you want to read the regulated pressure. The L means this is the low-pressure regulator type, whose exact regulation range is not published in the catalogue - we will confirm it on request so you can match it to your set pressure.
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.