The AirTAC GFR300C08MJF3T AirTAC Filter Regulator NPT 1/4 in 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 See datasheet ports, a differential-pressure 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 GFR300C08MJF3T is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This size 300 unit is threaded 1/4 in NPT and carries the 40 um standard filter element, with condensate released by hand through the manual drain on its metal bowl. The standard regulator covers 0.05-0.9 MPa (7-130 psi), read on the fitted square pressure gauge scaled in bar, and the unit accepts a maximum inlet pressure of 1.0 MPa (145 psi) at -5 to 70 C (non-freezing). It is supplied without a mounting bracket and without a reverse (check) valve.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and the decodable options include automatic or differential-pressure drains, a 5 um element (code W), alternative gauge scales, G (BSPP) or NPT threads in place of the PT standard, and mounting brackets. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet and sizing figures for your application.
| Model | GFR300C08MJF3T AirTAC Filter Regulator NPT 1/4 in |
|---|---|
| Series | GFR300 filter regulator |
| Port size | See datasheet (PT 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 | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — factory standard, Factory standard 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. |
|---|---|
| C0 | Port size See datasheet. This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| (blank) | Drain: Differential-pressure 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). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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 · See datasheet · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-C0 (two-unit set) |
Point-of-use conditioning on a CNC machining centre: the filter element strips water and particulate from shop air before it reaches the spindle drawbar and tool-changer cylinders, while the regulator holds a steady setting for consistent clamping.
On a bottling or food packaging line, the unit conditions and regulates the air feeding conveyor gate cylinders and stopper gates; the manual drain lets an operator clear collected condensate at shift start before the line runs.
Mounted ahead of a solenoid valve manifold on an assembly station, the filter regulator protects directional control valves and air cylinders from water and particulate while holding the pressure the valve stack was set up for.
Pick the size and port against the air demand of the circuit: this unit is size 300 with a 1/4 in NPT port, and the family steps through 200/300/400/600 with ports from 1/8 to 1 in, so move up a size where the line needs more flow. Drain type is a real operating choice: manual (as here) means an operator drains the bowl, while automatic (A) and differential-pressure (blank) drains handle condensate continuously; a manual drain also gives the widest regulation range of 0.05-0.9 MPa (7-130 psi). The 40 um element is standard; specify code W for the 5 um grade where finer filtration is needed. Gauge scale (MPa, psi or bar), thread (PT standard, G or NPT to order) and bracket are all selectable; this configuration carries a square bar gauge and no bracket. Because flow is published as curves rather than a single rating, 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 GFR300 as curves rather than a single rated figure, so we do not quote a number here. Tell us your operating pressure and the air demand of the circuit and we will confirm the sizing from the datasheet on request.
The M in the code sets a manual drain: an operator opens it to release collected condensate from the bowl. The family also offers automatic (code A) and differential-pressure (blank) drains that handle condensate without attention, and the manual-drain version carries the widest regulation range of 0.05-0.9 MPa (7-130 psi).
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.