The AirTAC GFR300-08 AirTAC Filter Regulator, NPT1/4, 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 PT1/4" 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 size 300 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, a 5 um filter element (the finer of the two catalogue grades), an automatic drain that expels collected condensate without manual attention, a fitted embedded square gauge scaled in MPa, and a standard regulator with an adjustment range of 0.15-0.9 MPa (20-130 psi). Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl suits the 300 size, and a mounting bracket is included.
This is a genuine AirTAC part. The GFR family is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of manual, automatic or differential-pressure drain, 40 um or 5 um filtration, gauge and scale options, and PT, G or NPT threads. Because flow is published as curves rather than a single rated figure, we confirm the datasheet and flow data for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator, NPT1/4, 5 um, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (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 — square, MPa 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. |
| (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. |
| (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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeding clamps and small press cylinders on a machining cell, where the 5 um element protects directional valves and the regulator holds a repeatable clamping pressure.
A single-body filter regulator at the air inlet of cartoning or wrapping equipment, with the automatic drain keeping condensate out of the machine during unattended runs.
Regulating and filtering the air feeding conveyor diverters, stoppers and cleaning blow-offs, with the MPa gauge giving operators a local pressure reference.
Size 300 with a 1/4 in port is the middle step of the GFR range; step up to 400 or 600 when the circuit demands more flow, or down to 200 for compact points of use. The 5 um element in this model suits air that feeds sensitive valves, cylinders or instrumentation; the standard 40 um grade is sufficient for general shop-air duty. The automatic drain keeps the bowl clear without operator attention - choose manual drain only where an operator is routinely present, or differential-pressure drain where draining on pressure drop is preferred. The square gauge is scaled in MPa; psi and bar scales and an external round gauge are order options. This unit is ordered with NPT thread; PT is the catalogue standard and G (BSPP) is also available. A bracket is included with this size.
Flow for the GFR300 is published as curves, not as a single rated number, so we do not quote a flow figure here. Ask us to confirm the flow curve and datasheet 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 GFR300 as curves rather than a single rated figure, so we do not state a flow number. Send us your application details and we will confirm the flow curve and full datasheet on request before you order.
The automatic drain expels collected condensate from the bowl on its own, which suits equipment that runs unattended or in hard-to-reach positions. This model keeps the 5 um element and square MPa gauge; manual and differential-pressure drain versions, a 40 um element, and PT or G threads are available as order options in the same size.
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.