The AirTAC GFR300-15T 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 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 GFR300-15T is a size-300 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration carries a 1/2 in NPT port, a manual drain bowl in polycarbonate, a standard 40 um filter element, the low-pressure regulator type, a round pressure gauge scaled in MPa, and a built-in reverse (check) valve. It is supplied without a mounting bracket.
This is a genuine AirTAC part. The GFR family is offered in sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, a choice of manual, automatic or differential-pressure drain, 40 um or 5 um (code W) filtration, gauge and thread options, and standard or low-pressure regulator types. Flow is published as curves rather than a single rating, so we confirm the datasheet figures for your application on request.
| Model | GFR300-15T AirTAC Filter Regulator NPT1/2 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 — round, 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". |
| 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. |
| 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. |
| 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) |
A clamping fixture on a machining cell that must hold workpieces at reduced regulated pressure uses this filter regulator to clean the supply and set the holding pressure, with the check valve helping hold the circuit if upstream air dips.
Carton-forming and case-sealing machines run many small cylinders on a shared 1/2 in air drop; this unit filters water and scale out of the drop and regulates it to the pressure the machine builder specifies.
A lab bench running air-operated apparatus from a shop-air header needs particulate and moisture removed plus a stable, lower regulated pressure; the manual drain suits a supervised environment where an operator drains the bowl at shift end.
Start with the port step: size 300 covers the 1/2 in port on this model, and the larger the size the greater the flow path, so step up if your line demands more air. Choose the drain to match maintenance habits: manual (this model) needs periodic draining by hand, automatic drains on its own, and differential-pressure drains only when a pressure drop builds. Pick 40 um for general protection or 5 um (code W) for finer downstream cleanliness. The low-pressure regulator type on this unit suits circuits regulated to lower pressures; quote the exact adjustment range from the datasheet before committing. Gauge scale (MPa, psi or bar), thread (PT standard, G or NPT to order) and bracket are all decodable choices.
Because flow is published as curves and not a single rated figure, 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR300 series as curves, not as a single rated number, so we do not quote a figure here. Tell us your application and we will confirm the flow behaviour from the datasheet on request before you order.
The M in the code selects a manual drain: condensate collects in the polycarbonate bowl and is released by hand, which suits attended installations. The L selects the low-pressure regulator type, intended for circuits regulated to lower pressures; the exact adjustment range for this type is not published in the standard tables, so we confirm it from the datasheet on request.
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.