The AirTAC GFR300-15G AirTAC Low-Pressure Filter Regulator 1/2 in 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 GFR300-15G is a low-pressure filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration carries a G1/2 port, a 5 um filter element for finer filtration than the standard 40 um grade, a manual drain on the PC bowl, an embedded square gauge reading in psi, a fitted reverse/check valve, and a mounting bracket. As a low-pressure type, it is intended for circuits that run below standard line pressures; its exact adjustment range is not published in the catalogue and we confirm it on request.
This is a genuine AirTAC part from the GFR300 size family. The GFR line spans sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, thread choices of PT (standard), G and NPT, drain types, filter grades and gauge scales. Flow is published as curves rather than a single rated figure, so we confirm flow and other datasheet figures on request before you order.
| Model | GFR300-15G AirTAC Low-Pressure Filter Regulator 1/2 in |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (G (BSPP) 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 — square, 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". |
| 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| G | G (BSPP) 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) |
Prepares and regulates air feeding clamp cylinders on a CNC machining cell, where the low-pressure type runs the clamping circuit below standard line pressure and the 5 um element protects the clamp valves from particulate.
Sits at the drop feeding pneumatic actuators on a carton-sealing and case-packing line, filtering condensed water from the compressed air and holding a steady reduced pressure to the cylinders, with the psi gauge giving operators a local reading.
Conditions the air feeding pilot valves and small actuators on laboratory automation benches, where the 5 um grade suits sensitive components, the check valve holds downstream pressure if supply dips, and the manual drain fits a supervised environment.
Size 300 with a 1/2 in G-thread port suits lines where the required flow sits in the mid range of the GFR family; step up to size 400 or 600 for larger demand, or down to size 200 for compact circuits. The 5 um element (code W) is the finer choice over the standard 40 um grade when downstream valves or instruments need cleaner air. The manual drain means an operator opens the bowl drain periodically, which suits attended installations; choose automatic or differential-pressure drain codes where the unit runs unattended. The square gauge here reads psi; MPa and bar scales are available, and an external round gauge is optional. PT is the standard thread; G and NPT are order options. A bracket is included in this code.
Flow for this family 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. 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 one number. Tell us your line pressure and the flow your application needs, and we will confirm the correct size against the datasheet curves on request before you order.
The M in the code selects a manual drain: an operator opens the bowl drain periodically to remove collected water, which suits attended installations; automatic and differential-pressure drain codes are available in the same size. This is the low-pressure regulator type, and its exact adjustment range is not published in the catalogue, so we confirm it on request. Maximum inlet pressure is 1.0 MPa (145 psi).
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.