The AirTAC AirTAC GFR300-10 Filter Regulator, 3/8 in NPT, Manual 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 PT3/8" ports, a manual drain and regulates 0.05 - 0.9 MPa (7 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The AirTAC GFR300-10 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This 300-size unit has a 3/8 in NPT port, a polycarbonate bowl with manual drain, a 40 um standard filter element, an embedded square gauge scaled in bar, and a built-in reverse (check) valve. No mounting bracket is included (code J). Maximum inlet pressure is 1.0 MPa (145 psi), the working temperature range is -5 to 70 C (non-freezing), and the regulation range for this manual-drain configuration is 0.05-0.9 MPa (7-130 psi).
This is a genuine AirTAC part. The GFR family is available in sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and with choices of drain type, 40 um or 5 um (W) filtration, gauge scale (MPa, psi or bar), thread (PT standard, G or NPT to order) and bracket. Rated flow is published as curves rather than a single figure, so ask us to confirm flow and datasheet details for your application before ordering.
| Model | AirTAC GFR300-10 Filter Regulator, 3/8 in NPT, Manual Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, bar 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. Standard type, regulating 0.05 - 0.9 MPa (7 - 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. |
|---|---|
| 10 | Port size PT3/8". This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 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. |
| 3 | Gauge scale: bar. 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. |
| 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 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Feeding filtered, regulated air to the workpiece-clamping and tool-change cylinders of a CNC machining centre, where clean, steady pressure keeps fixtures holding consistently through a shift.
Supplying the pusher and diverting cylinders on a carton packaging conveyor, where the manual-drain bowl is emptied during scheduled line cleaning and the check valve holds downstream pressure.
Conditioning the air feeding solenoid valve banks on weaving and spinning machines, removing water and 40 um particulate before it can foul valve spools and seats.
Size and port set the capacity: this 300-size unit has a 3/8 in NPT port; step up to 400 or 600 if your air demand is higher. Drain type is a real choice - manual (this unit) needs periodic draining, while automatic or differential-pressure drains empty the bowl without attention. Filter grade is 40 um standard; specify W for 5 um finer filtration. The gauge here is the embedded square type scaled in bar; MPa and psi scales are available, and an external round gauge is optional. Thread is NPT on this model; PT is the standard and G is an order option. A bracket can be added; no bracket is included on this unit (code J). 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
Flow for this series is published as curves rather than a single rated figure, so we do not quote a number here. Send us your application details and we will confirm the flow and full datasheet figures on request before you order.
This unit carries drain code M: collected water is emptied by opening the drain by hand as part of routine checks. If you cannot schedule draining, the same series is available with automatic or differential-pressure drains - ask us for those variants.
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.