The AirTAC GFR300-15 NPT1/2 AirTAC Filter Regulator, 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 regulates downstream pressure in a single body. This 300-size unit is fitted with a 1/2 in NPT port, a 5 um filter element (code W) for finer filtration than the standard 40 um grade, and an automatic drain that expels collected condensate without manual attention. It is a low-pressure type (code L) for applications that run below standard regulator settings, and it carries a reverse/check valve (code K) that holds downstream pressure if the upstream supply drops. The embedded square gauge (scale 1, MPa) shows outlet pressure at a glance, and the polycarbonate bowl suits the 300 size frame.
This is a genuine AirTAC part from the GFR series, which spans 200, 300, 400 and 600 sizes with port options from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drain, 40 um or 5 um filtration, standard or low-pressure regulation, gauge scale options in MPa, psi or bar, and G, NPT or PT threads. Flow is published as curves rather than a single rating, so ask us to confirm sizing and datasheet figures for your application before ordering.
| Model | GFR300-15 NPT1/2 AirTAC Filter Regulator, 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 | 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, 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". |
| A | Drain: Automatic 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). |
| F | Gauge shape: Square. C is round, F is square. |
| 1 | Gauge scale: MPa. 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) |
Feeding clean, regulated air to the tool-changing and clamping circuits on a machining centre, where the 5 um element protects precision valves from particulate and the check valve holds clamp pressure during a supply dip.
Regulating air to pneumatic cylinders and diverters on a packaging or bottling conveyor, with the automatic drain keeping condensate out of the circuit on a line that runs unattended across shifts.
A point-of-use filter regulator at an assembly cell air drop, giving operators a local MPa gauge reading, low-pressure regulation for sensitive tooling, and protection of downstream fittings from water and scale.
Step up or down through the GFR sizes (200/300/400/600) against the flow your line needs - the 300 size with its 1/2 in port sits mid-range. Choose the 5 um element (this unit, code W) when downstream equipment such as valves or actuators needs finer air than the standard 40 um grade. Pick the automatic drain (fitted here) where the unit is hard to reach or runs unattended; manual drain suits attended installations, and differential-pressure drain is the default. This is the low-pressure type (L), so confirm your working band suits it - the exact range is not published and we will confirm on request. The square gauge reads in MPa (scale 1); psi or bar scales and an external round gauge are orderable options. Thread is NPT here; PT is the catalogue standard and G (BSPP) is also available. A mounting bracket is included, and the reverse/check valve (K) is fitted. Because flow is published as curves rather than a single rating, 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 GFR flow as performance curves rather than a single rated figure, so we do not quote a rated flow number. Tell us your application and required flow, and we will confirm sizing against the datasheet curves on request before you order.
The A in the code sets the automatic drain, which ejects collected condensate on its own - useful where the unit is mounted out of reach or the line runs unattended. The K adds a reverse/check valve that holds downstream pressure if upstream supply is lost. If you would rather drain manually or rely on the default differential-pressure drain, other GFR300 variants are available.
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.