The AirTAC GFR300C15LJF3TK AirTAC Filter Regulator NPT1/2 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 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 GFR300C15LJF3TK is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This size 300 unit is specified with a 1/2 in NPT port, the low-pressure regulator type, a 40 um standard filter element and a differential-pressure drain that bleeds collected condensate automatically as flow passes through. A square pressure gauge with a bar scale is fitted so the setting can be read directly at the unit, and a reverse (check) valve is included to hold downstream pressure if the upstream supply is lost. No mounting bracket is supplied with this configuration.
This is a genuine AirTAC part from the GFR range, which spans sizes 200, 300, 400 and 600 with a choice of ports, thread standards (PT standard; G and NPT as order options), drain types, 40 um or 5 um filtration and gauge scales. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Because flow is published as curves rather than a single rating, we confirm the datasheet and flow figures for your application on request.
| Model | GFR300C15LJF3TK AirTAC Filter Regulator NPT1/2 Low-Pressure |
|---|---|
| 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. |
|---|---|
| C1 | 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-C1 (two-unit set) |
Fixture clamps and swing cylinders on a machining centre often need to be held at a reduced, repeatable pressure rather than full line pressure. This low-pressure filter regulator cleans the supply and lets the setter dial in the clamp circuit, with the bar-scale gauge readable at the unit and the check valve holding the setting if shop air drops.
On a cartoning or case-packing line, cylinders that push, lift and divert product run continuously and are sensitive to dirt and moisture in the air supply. A size 300 filter regulator at the line drop conditions the air and regulates the circuit pressure, while the differential-pressure drain keeps condensate moving out during production.
Bench-top reactors, sample handling rigs and pilot-scale pneumatic circuits need clean, dry air at a gentle, stable pressure. This unit filters the lab compressor supply to 40 um and regulates it at low-pressure settings, with the square bar gauge giving the operator a direct local reading at the panel.
Size 300 with a 1/2 in port sits in the middle of the GFR range; step up to 400 or 600 when your flow demand outgrows the port, or down to 200 for compact circuits. This code fixes the low-pressure regulator type, so if your process needs to hold reduced supply pressures rather than full line pressure, this is the right variant - ask us to confirm its exact adjustment range, which is not published as a single figure. The 40 um element is the standard grade; add a W-suffix unit if you need 5 um protection. Drain is differential-pressure (automatic with flow); a manual-drain or fully automatic-drain version can be ordered instead. The square gauge reads in bar; MPa and psi scales are alternatives, and an external round gauge is optional. Thread here is NPT; PT is the standard and G (BSPP) is also orderable. No bracket is fitted with this code, so plan your mounting accordingly. Flow for this family is published as curves, 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, not as a single rated figure, so we do not quote a number here. Send us your application - port size, upstream pressure and the equipment downstream - and we will confirm the flow figures from the datasheet and check the sizing with you before you order.
L marks the low-pressure regulator type, so this unit is intended for circuits regulated at reduced pressures - ask us to confirm its exact adjustment range, which is not published as a single figure. K means a reverse (check) valve is fitted, holding downstream pressure if the supply is interrupted. The drain is the differential-pressure type: it discharges collected condensate automatically as air flows through, with no manual draining needed during normal operation.
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.