The AirTAC GFR300-15 AirTAC Filter Regulator 1/2 in NPT 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 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 GFR300-15 is an AirTAC GFR-series filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the size-300 unit with 1/2 in NPT ports, a manual drain bowl in polycarbonate, a 40 um standard filter element, the low-pressure regulator type, a built-in square pressure gauge scaled in MPa, and no mounting bracket. The manual drain means an operator opens the bowl drain to expel collected condensate, which suits installations visited during routine checks. As a low-pressure type, it is intended for circuits where the regulated setpoint sits below the standard regulator's range; the exact adjustment range for this variant is not published, and we confirm it from the datasheet on request.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, a choice of drain type, a 40 um standard or 5 um (code W) element, gauge and scale options, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so we confirm flow and datasheet figures against your application on request.
| Model | GFR300-15 AirTAC Filter Regulator 1/2 in NPT Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (NPT thread) |
| Filtering grade | 40 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 — square, MPa 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. 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). |
| F | Gauge shape: Square. C is round, F is square. |
| 1 | Gauge scale: MPa. 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. |
| (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 · PT1/2" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
Feeding clean, regulated air to the cylinder and valve manifold bank on a carton-forming or wrapping machine, where the low-pressure regulator type holds a reduced setpoint for gentle clamping and sealing motions.
Supplying filtered, regulated air to hold-down cylinders, air-operated gates and diverters along a conveyor line, with the 1/2 in port serving a branch that runs several actuators from one takeoff.
Providing a clean, manually adjustable low-pressure supply to a bench where pneumatic valves and small actuators are function-checked, with the MPa gauge giving the technician a direct setpoint readout.
Start with the port and size: this unit is size 300 with 1/2 in NPT ports; step up to size 400 or 600 if the circuit needs more flow capacity, or down to 200 for smaller lines. Drain type is a real choice here: this model has a manual drain, while automatic and differential-pressure drains are available in the family if the bowl cannot be drained by hand on your schedule. The element is the 40 um standard grade; specify the 5 um W variant if finer filtration is required. The gauge is the embedded square type scaled in MPa; external round gauges and psi or bar scales are catalogue options. Thread is NPT on this unit; PT and G (BSPP) versions can be ordered. No mounting bracket is fitted on this code; bracketed versions exist. Flow is published as curves, not a single rating, so ask us to confirm sizing against your application before ordering.
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 rather than a single rated figure, so we do not quote a rated flow, Cv or l/min number. Tell us your application and we will confirm the flow and datasheet figures for this exact unit on request before you order.
The M in the code gives the bowl a manual drain: collected condensate is released by opening the drain when an operator attends the unit, which suits installations checked on a routine schedule. If the bowl cannot be attended regularly, automatic or differential-pressure drain variants are available in the GFR family and we can quote the equivalent code.
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.