The AirTAC GFR300-15 AirTAC Filter Regulator 1/2 in PT 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 differential-pressure 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 regulates downstream pressure in a single body. This 300-size unit is fitted with a PT1/2 (1/2 in) PT-threaded port, a 40 um standard filter element, and a differential-pressure drain that bleeds collected condensate automatically whenever the pressure differential across the bowl is high enough. It is the low-pressure (L) type, intended for circuits where the regulated pressure sits below the standard unit's range, and it carries a round external gauge scaled in psi. A reverse/check valve (K) is fitted, and the mounting bracket is included. The polycarbonate bowl suits this size class.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, and is ordered with your choice of drain type, filter grade (40 um standard, 5 um with code W), gauge style and scale, thread (PT standard, G and NPT as order options), and bracket. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application before ordering.
| Model | GFR300-15 AirTAC Filter Regulator 1/2 in PT Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (PT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 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 | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, 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". |
| (blank) | Drain: Differential-pressure drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 130 psi)). |
| L | Low-pressure type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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) |
On a fixture-clamping circuit that holds workpieces at a reduced regulated pressure, this filter regulator cleans the supply and sets the clamp pressure, with the psi gauge giving the operator a direct reading at the station.
Feeding cylinders and actuators on a packaging or cartoning conveyor, the unit strips water and 40 um particulate from plant air and regulates the pressure the actuators see, while the check valve holds the downstream setting if supply dips.
On a skid where pneumatic quarter-turn valves are operated at modest regulated pressures, the low-pressure type regulator sets the actuator supply, the differential-pressure drain keeps condensate off the valve internals, and the bracket simplifies panel mounting.
Step up or down through the GFR sizes (200/300/400/600) so the port and body match the flow your line needs; this 300 size carries a PT1/2 port. Choose the drain: differential-pressure (this unit, automatic in operation), fully automatic (A), or manual (M) where you want to drain by hand. Pick the filter grade: 40 um standard for general plant air, 5 um (code W) for finer protection. Select the gauge: embedded square as standard, or an external round gauge like this one, scaled in MPa, psi or bar - this unit reads psi. Specify thread as PT (standard) or order G (BSPP) or NPT. A bracket is included; on some sizes J omits it.
Flow for the GFR series is published as curves, not a single rated number, so the honest route is to send us your application details and we will confirm the datasheet figures and correct size 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 GFR-series flow as curves rather than a single rated figure, so we do not quote a rated flow, Cv or SCFM number for this unit. Send us your application details and we will confirm the datasheet flow curves and check the 300 size against your required flow before you order.
The L code makes this a low-pressure regulator type, intended for circuits where the regulated pressure is below what the standard unit covers; the exact adjustment range for this variant is not published, so we confirm it on request. The drain is differential-pressure type: condensate collected in the bowl is discharged automatically when the pressure differential is sufficient, with no manual draining needed.
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.