The AirTAC AirTAC GFR300-15 Filter Regulator NPT1/2, 5 um, Low-Press 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 PT1/2" 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 GFR300-15LJF1WTK is a 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the low-pressure regulator type with a 5 um filtration element (code W), a differential-pressure drain on the polycarbonate bowl, an embedded square gauge scaled in MPa, and a built-in reverse/check valve (code K). It has a 1/2 in NPT port (code T) and is supplied without a mounting bracket (code J). Max 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 is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of 40 um standard or 5 um (W) filtration, differential-pressure, automatic or manual drains, gauge and scale options, and PT, G or NPT threads. Because flow is published as curves rather than a single rating, we confirm flow and datasheet figures for your application on request.
| Model | AirTAC GFR300-15 Filter Regulator NPT1/2, 5 um, Low-Press |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (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, MPa 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). |
| F | Gauge shape: Square. C is round, F is square. |
| 1 | Gauge scale: MPa. 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 · PT1/2" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
Feeds and regulates the clamp cylinders on a fixture line at reduced pressure, with 5 um air protecting the valve stack and the check valve holding the circuit if supply is interrupted.
Conditions and steps down shop air ahead of spray guns, where the 5 um element keeps oil and water mist out of the finish and the low-pressure type suits gentle atomizing setups.
Filters and regulates the air driving diverters and pusher cylinders on a packaging line, with the MPa gauge giving operators a visible setpoint and the differential-pressure drain handling condensate in service.
Step up or down through the GFR sizes (200/300/400/600) so the port and body match the flow your line needs; this 300-size unit carries a 1/2 in port. Choose the drain to suit the installation: differential-pressure (this model, drains as pressure drops), automatic for unattended condensate removal, or manual where someone checks the bowl routinely. Pick 40 um for general protection or 5 um (W, as here) for finer downstream cleanliness. Gauges are embedded square as standard with optional external round gauges in MPa, psi or bar scales; this unit carries the square MPa gauge. Threads: PT is the standard form, with G (BSPP) and NPT (as on this model) as catalogue options to order. Brackets are optional (code J omits the bracket). The K code adds a reverse/check valve. One honest note before ordering: flow is published as curves, not a single rating, so ask us to confirm sizing against your application before you commit.
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, downstream pressure and required air consumption, and we will confirm the flow and the full datasheet figures for this exact model on request.
L marks the low-pressure regulator type, intended for applications where the regulated output sits well below standard settings. The exact regulation range for the low-pressure variant is not published in the material we hold, so we confirm it on request. The rest of the code decodes as: 300 size, 1/2 in NPT port, no bracket (J), square MPa gauge (F1), 5 um element (W), NPT thread (T) and reverse/check valve (K).
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.