The AirTAC GFR300C08LJNTK AirTAC Low-Pressure Filter Regulator NPT1/4 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 See datasheet 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 GFR300C08LJNTK is a GFR-series filter regulator: water and particulate filtration plus pressure regulation combined in a single body, in size 300 with a 1/4 in NPT port. This configuration is the low-pressure (L) type - its exact adjustment range is not published and is confirmed on request - and it carries the 40 um standard filter element, a polycarbonate bowl with differential-pressure drain, and a built-in reverse (check) valve (code K). No pressure gauge is fitted (code N) and no mounting bracket is included (code J). Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and catalogue options including the finer 5 um (W) element, automatic or manual drains, gauge choices, and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing figures for your application before ordering.
| Model | GFR300C08LJNTK AirTAC Low-Pressure Filter Regulator NPT1/4 |
|---|---|
| Series | GFR300 filter regulator |
| Port size | See datasheet (PT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Standard 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 — factory standard, Factory standard scale |
| 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). 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. |
|---|---|
| C0 | Port size See datasheet. 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)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| (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. |
| (blank) | PT 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 · See datasheet · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-C0 (two-unit set) |
Feeding low-pressure spray guns and atomising air on a paint line: the GFR element strips water and pipe scale from shop air while the low-pressure regulator holds a steady, gentle setting at the gun, and the check valve keeps the downstream side held if the supply drops.
Supplying the air cylinders that drive diverters, pushers and clamp gates on a packaging conveyor: filtered, regulated air protects cylinder seals and valve seats, with the built-in check valve preventing backflow out of the circuit during a supply interruption.
Point-of-use conditioning at a pneumatic control panel: one compact body filters and regulates the branch feeding solenoid valves and air logic on a machine frame, mounting directly in the 1/4 in NPT drop from the main distribution line.
Choose the size by port and flow: this 300 unit carries a 1/4 in NPT port; step up to 400 or 600 for larger ports and more flow, or down to 200 for compact branches. The filter grade here is the 40 um standard element - specify W for the 5 um grade where finer particulate removal matters. Drain is the differential-pressure type; automatic (A) and manual (M) drains are catalogue options. Thread options are PT (the standard), G (BSPP) and NPT - this code specifies NPT. Gauge and bracket choices also vary by code: this unit has no gauge and no bracket, and both are available elsewhere in the series. Because rated flow is published only as curves, not a single figure, send us your pressure and air-consumption conditions 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 GFR flow as curves rather than a single rated figure, so we do not quote a l/min or SCFM number here. Send us your inlet pressure, regulated setpoint and expected air consumption, and we will confirm the flow and sizing from the datasheet on request.
No. The N in the code means no gauge is fitted. The GFR series offers an embedded square gauge and an optional external round gauge with MPa, psi or bar scales, so ask us to quote a variant with the gauge and scale you need.
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.