The AirTAC GFR300-15LJ 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 PT1/2" 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 GFR300-15LJ 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 pressure drops across the element. The polycarbonate bowl lets you see the fluid level, a round external gauge on a psi scale shows the regulated pressure at a glance, and a reverse/check valve is fitted. No mounting bracket is included with this configuration.
This is a genuine AirTAC part from the GFR filter-regulator family, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in. Across the family you can order automatic, manual or differential-pressure drains, a 5 um element (code W), embedded square or external round gauges with MPa, psi or bar scales, and G, NPT or PT threads. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR300-15LJ AirTAC Filter Regulator, NPT1/2, Low Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (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 | Fitted — round, psi 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. |
|---|---|
| 15 | Port size PT1/2". 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). |
| C | Gauge shape: Round. C is round, F is square. |
| 2 | Gauge scale: psi. 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. |
| 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 · PT1/2" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
Feeding low-pressure atomising air to spray booths on a finishing line, where the low-pressure regulator type holds a gentle setpoint and the 40 um element keeps water and scale out of the paint supply.
Supplying regulated low-pressure air to curtain and blow-off nozzles along a packaging conveyor, with the check valve holding the circuit stable and the differential-pressure drain keeping condensate moving out.
Conditioning bench air on a laboratory or pilot-plant manifold, where the psi gauge gives a clear regulated reading and the polycarbonate bowl allows a quick visual check of collected moisture.
Size 300 with a 1/2 in NPT port suits lines that need more flow than the 200/300 small-port steps provide; step up to size 400 or 600 if your demand curves call for it. The low-pressure type (code L) is the right choice where the regulated setpoint sits below what a standard unit is aimed at - the exact adjustment range for this variant is not published, so confirm it with us. The 40 um element is the standard grade; order the W variant if you need 5 um filtration. This unit uses the differential-pressure drain, which needs no manual attention; automatic (A) and manual (M) drains are available elsewhere in the family. The round psi gauge is fitted here; embedded square gauges and MPa or bar scales are the alternatives. Thread options are PT (standard), G (BSPP) and NPT - this unit is NPT. Brackets are optional (this code has none).
Because flow is published as curves and not a single rated figure, we cannot quote you one number here. Send us your application details and we will confirm sizing and the datasheet figures before you order.
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 here. Tell us your line pressure, setpoint and air demand and we will confirm the sizing against the datasheet curves on request before you order.
The L in the code marks the low-pressure regulator type, intended for applications where the regulated pressure sits below the standard unit's normal working band; the exact adjustment range for this variant is not published, so confirm it with us. The J in the code means no mounting bracket is included - brackets are an optional extra across the GFR family if you want panel or wall mounting.
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.