The AirTAC GFR300-15 AirTAC Filter Regulator NPT1/2, 5 um, Auto Drain 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 automatic 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 GFR300-15 is a filter regulator: it removes water and particulate from compressed air and holds downstream pressure steady in a single 300-size body. This configuration is threaded NPT1/2, carries the 5 um filter element (code W) for finer filtration than the 40 um standard element, and drains condensate automatically, so the bowl does not rely on someone opening a manual drain. The regulator is the standard type with an adjustment range of 0.15-0.9 MPa (20-130 psi), a round external gauge scaled in bar is fitted, and a reverse/check valve (code K) is built in to hold downstream pressure when the supply drops. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. The polycarbonate bowl is standard at this size, and no mounting bracket is included (code J).
This is a genuine AirTAC part. The GFR family is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, in PT, G and NPT threads, with a choice of drain type, filter grade, gauge style and scale, and with or without a check valve or bracket. Flow is published in the catalogue as curves rather than a single rated figure, so ask us and we will confirm the flow and datasheet figures for this exact model against your application before you order.
| Model | GFR300-15 AirTAC Filter Regulator NPT1/2, 5 um, Auto Drain |
|---|---|
| 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 | Standard 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 | Automatic 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). 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". |
| A | Drain: Automatic drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 130 psi)). |
| (blank) | Standard 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) |
Mounted at the drop feeding a CNC machining centre, the unit filters machining-air moisture and swarf carryover down to 5 um, regulates the pressure feeding tool-change cylinders and air bearings, and the check valve holds the setting through brief supply dips. The automatic drain keeps the bowl clear on a machine that runs unattended shifts.
On a bottling line, the GFR300-15 conditions the air feeding filler grippers, capping heads and reject gates: clean, dry-enough air at a regulated pressure that keeps actuator speeds repeatable. The round bar gauge gives operators a direct local reading, and automatic drainage suits a wet compressor room serving the whole line.
Feeding the pneumatic diverters and pushers of a parcel sortation conveyor, the unit holds a steady working pressure so divert timing stays consistent across the shift, while 5 um filtration protects the solenoid valves and cylinders from particulate. The check valve prevents back-feed through the branch when an upstream section is isolated.
Step up or down through the GFR sizes (200, 300, 400, 600) and their port sizes (1/8 to 1 inch) to match the air demand of the circuit; the 300 size with its 1/2 inch port sits in the middle of the range for general machine supply. Choose the drain to suit access: automatic (this model) suits installations that are not checked daily, manual suits attended stations, and differential-pressure drain is the catalogue default. Choose the 5 um element (W) where finer filtration matters, or the 40 um standard where it does not. Pick the gauge style and scale you want to read - embedded square or external round, in MPa, psi or bar (this unit has a round bar gauge) - and specify PT, G or NPT thread to match your piping; PT is the catalogue standard and G/NPT are ordered options. A bracket can be added where the unit needs panel support (this model omits it, code J), and the K option adds a check valve. Because flow is published as curves rather than a single rating, send us your application details and we will confirm sizing against the datasheet before you order.
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 number, so we will not quote you a figure that is not on the datasheet. Send us your application - port size, downstream consumption and working pressure - and we will confirm the flow curve and sizing for this exact model on request before you order.
Both are decode choices in the model code. The A gives an automatic drain, which ejects condensate without manual attention; manual (M) and differential-pressure (blank) drains are available if you prefer. The W gives the 5 um filter element instead of the 40 um standard - choose 5 um where finer protection of valves and cylinders matters. The same body is also offered with different gauge scales, PT/G/NPT threads, and with or without the check valve (K) and bracket (J).
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.