The AirTAC GFR300-15MLJC3WTK AirTAC Filter Regulator NPT1/2 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 manual drain and regulates 0.05 - 0.9 MPa (7 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The AirTAC GFR300-15MLJC3WTK is a size 300 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration carries a 1/2 in NPT port, a fine 5 um filter element (code W), a manual drain bowl in polycarbonate, the low-pressure regulator type, a round pressure gauge with bar scale, and a built-in reverse/check valve that holds downstream pressure when the upstream supply is lost. No mounting bracket is included, so plan for direct pipe or manifold mounting.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in and thread options in PT, G (BSPP) and NPT. Drain, filter grade, gauge and valve options vary by code. Flow is published as curves rather than a single rating, so ask us to confirm sizing and any datasheet figure against your application before ordering.
| Model | GFR300-15MLJC3WTK AirTAC Filter Regulator NPT1/2 |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, bar 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 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. |
| 3 | Gauge scale: bar. 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) |
A fixture line where cylinders clamp workpieces needs clean, regulated air at a modest set pressure. This unit filters water and swarf at 5 um, regulates downstream pressure, and its check valve holds the clamp position if the main supply drops.
Cartoning and wrapping machines run air cylinders and actuators from a single drop. A filter regulator at the machine inlet keeps moisture and particles out of the valves while the low-pressure regulator type suits circuits specified below standard set pressures.
Bottling and filling lines use low-pressure air for blow-off and drying nozzles. This unit strips condensate and fine particles before the nozzles and lets operators set and read the pressure on the round bar gauge.
Start with the port step: size 300 with a 1/2 in NPT port suits lines fed at that connection size, and larger sizes carry more flow - match the size to the air demand of the circuit rather than upsizing blindly. Choose the drain to suit access: manual drain (this unit) needs an operator to bleed the bowl, automatic drains themselves, and the differential-pressure default drains on a pressure drop. Filter grade is 40 um standard or 5 um fine (code W) where downstream valves and instruments need cleaner air. Gauge options are an embedded square gauge or an external round gauge with MPa, psi or bar scales - this unit carries the round gauge in bar. Thread is PT as standard with G (BSPP) and NPT as order options, and a bracket can be added on request.
One honest routing note: AirTAC publishes flow as curves, not a single rated figure, so send us your flow and pressure requirements and we will confirm sizing against the datasheet before you order. The exact regulation range of the low-pressure type is likewise confirmed on request.
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 rather than a single rated figure, so we do not quote a number. Send us your line pressure, set pressure and air demand, and we will confirm the sizing from the datasheet on request before you order.
The M in the code selects a manual drain: an operator bleeds accumulated condensate from the polycarbonate bowl, which suits accessible mounting points or intermittent duty; automatic and differential-pressure drains are available on other codes. The K code fits a reverse/check valve, which stops downstream air from escaping back through the unit if the upstream supply is lost.
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.