The AirTAC AirTAC GFR300-10 Filter Regulator NPT3/8, 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 size-300 filter regulator that removes water and particulate from compressed air and sets downstream pressure in a single body. This configuration carries a 3/8 in NPT port, a manual drain bowl in polycarbonate, a 40 um standard filter element, and an embedded square gauge scaled in bar. The standard regulator covers a setting range of 0.05-0.9 MPa (7-130 psi), and the maximum inlet pressure is 1.0 MPa (145 psi).
This is a genuine AirTAC part. The GFR300 series is one of four sizes (200/300/400/600) with port sizes from 1/8 to 1 inch, drain choices (manual, automatic, or differential-pressure), a 5 um optional element, and optional external round gauges. Flow is published as curves rather than a single rating, so we confirm datasheet figures on request.
| Model | AirTAC GFR300-10 Filter Regulator NPT3/8, 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 | 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 0.05 - 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. |
| (blank) | Mounting bracket included. |
| (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. |
| (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 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Drops the shop air main to a clean, regulated supply at an assembly cell, filtering water and pipe scale before it reaches the cell's tools and cylinders.
Feeds filtered, pressure-set air to a machining centre's pneumatic actuators and tool-change circuit, with the manual drain bled during scheduled maintenance.
Regulates and cleans the air feeding conveyor stop gates and packaging clamps, keeping moisture and debris out of the line's control valves.
Size 300 with a 3/8 in NPT port suits lines that need more flow than the 200/1/4 in step without moving to the 400 frame; match the size to the flow curve for your application. This unit has a manual drain, which suits installations where an operator can bleed the bowl on a routine walk-round; choose automatic or differential-pressure drain if the bowl cannot be attended. The 40 um element is the standard grade for general plant air, with 5 um (code W) available where finer filtration is needed. The fitted square gauge reads in bar; MPa and psi scales are also catalogue options. NPT is the thread on this code, with G (BSPP) and PT available to order, and the mounting bracket is included.
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 series as curves, not as a single rated figure, so we do not quote a number here. Ask us and we will confirm the flow data from the datasheet against your application before you order.
The M in the code specifies a manual drain: condensate collected in the polycarbonate bowl is released by hand. It suits installations an operator visits regularly. If the bowl cannot be attended, the same series is available with automatic or differential-pressure drain instead.
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.