The AirTAC GFR300-08 AirTAC Filter Regulator 1/4 in NPT Auto Drain 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 PT1/4" 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 GFR300-08 is a 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration has a 1/4 in NPT port, an automatic drain that ejects collected condensate without manual attention, a 40 um standard filter element, and a square pressure gauge reading in psi. The standard-type regulator adjusts from 0.15 to 0.9 MPa (20-130 psi), and the unit handles a maximum inlet pressure of 1.0 MPa (145 psi) at temperatures from -5 to 70 C (non-freezing). The polycarbonate bowl suits this size class.
This is a genuine AirTAC part. The GFR series is available in 200, 300, 400 and 600 sizes with port options from 1/8 in to 1 in, thread choices of PT (standard), G or NPT, automatic, manual or differential-pressure drains, a 5 um optional element, and gauge scale choices. We confirm flow and datasheet figures on request, since flow is published as curves rather than a single rating.
| Model | GFR300-08 AirTAC Filter Regulator 1/4 in NPT Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 40 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 — 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. 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. |
|---|---|
| 08 | Port size PT1/4". 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). |
| F | Gauge shape: Square. 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. |
| 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 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Clean, regulated air feeding the tool-change clamps and air-blast nozzles on a machining centre, with the automatic drain handling condensate between shifts.
Point-of-use pressure control for pneumatic cylinders on a carton-forming and sealing conveyor, where a stable setpoint keeps wrap and seal strokes consistent.
Filtering and regulating the air at individual drop points on a loom floor, protecting solenoid valves and small actuators from water and scale carryover.
Choose the size and port step (200 through 600, 1/8 in to 1 in) against the air demand of the circuit; the 300 size with a 1/4 in NPT port is a common match for compact machines and point-of-use drops. Select the drain to suit access: automatic (this model) for unattended duty, manual where an operator drains routinely, or the differential-pressure default. Pick the 40 um standard element for general air preparation or the 5 um (W) option where finer filtration is needed. Gauge scale is selectable (MPa, psi or bar), and PT is the standard thread with G and NPT as order options; a bracket is optional (this unit is supplied without one). Flow for this series 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 figure, so we do not quote a number here. Send us your air demand and line conditions and we will confirm the sizing against the datasheet curves on request.
The A in the code specifies an automatic drain, which ejects collected condensate from the bowl without operator attention - useful for unattended or hard-to-reach installations. The series also offers manual drain (code M) and the differential-pressure default, so you can match the drain to how the unit is accessed and operated.
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.