The AirTAC GFR300-15 AirTAC Filter Regulator NPT1/2 5um 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 configuration is the 300 size with a 1/2 in NPT thread, fitted with a 5 um filter element (code W) for finer filtration than the standard 40 um grade, an automatic drain that expels collected condensate without manual attention, a low-pressure regulator type, and an embedded square gauge scaled in psi. No mounting bracket is included (code J), and no reverse/check valve is fitted. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR filter-regulator family is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, and with choices of drain type (differential-pressure, automatic or manual), filter grade (40 um standard or 5 um), gauge scale (MPa, psi or bar), thread (PT standard, with G and NPT as order options) and bracket. Flow is published as curves rather than a single rated figure, so we confirm the datasheet and sizing figures for your application on request.
| Model | GFR300-15 AirTAC Filter Regulator NPT1/2 5um 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, psi scale |
| Reflux valve | Not fitted |
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. |
| J | Supplied without bracket. |
| (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. |
| T | NPT thread. PT is the default; G is BSPP and T is NPT. |
| (blank) | No reverse-flow valve (the default). |
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) |
Supplying a light-duty pneumatic press or clamping fixture that operates at reduced line pressure: the filter section strips water and fine particulate before the regulator holds a stable, low set pressure, with the psi gauge giving the operator a direct reading at the machine.
Feeding clean, regulated air to a packaging line's cylinders and actuators. The 5 um element protects valve spools and cylinder seals from fine contamination, and the automatic drain clears condensate during continuous shifts without an operator opening the bowl.
Conditioning the air feeding pneumatic control components and panel-mounted devices on a process line, where the low-pressure regulator type matches control circuits that run below standard plant pressure and the automatic drain keeps the bowl clear in unattended equipment.
Choose the size and port step against the air consumption of the machine or line being supplied: the 300 size here carries a 1/2 in NPT port, and larger sizes carry larger ports and more flow. This unit is the low-pressure regulator type, suited to circuits that run below standard regulated pressures; its exact regulation range is not published in the material we hold, so ask us to confirm it against your set pressure before ordering. Drain options are differential-pressure (default), automatic (fitted here) and manual; the automatic drain suits unattended installations. Filter grade is 40 um standard or 5 um (code W, fitted here) where finer filtration is required. The embedded square gauge is standard and this one is scaled in psi; MPa and bar scales are available, and an external round gauge is optional. Thread is PT as the catalogue standard, with G (BSPP) and NPT as orderable options - this unit is the NPT version. A bracket is optional (not fitted here). Flow 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. Without the K option, air cannot flow back 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 do not quote a rated flow, Cv or SCFM figure. Send us your application's air consumption and line pressure and we will confirm the sizing from the datasheet curves on request.
The W code orders the optional 5 um filter element instead of the 40 um standard grade, for finer protection of downstream components, and the A code orders the automatic drain, which expels condensate without manual intervention (manual and differential-pressure drains are the other options). This is the low-pressure regulator type; its exact regulation range is not published in the material we hold, so ask us to confirm it against your set pressure before ordering.
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.