The AirTAC GFR300C08MNTK AirTAC Filter Regulator 1/4 in NPT 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 GFR300C08MNTK is an AirTAC GFR300 filter regulator: one body that removes water and particulate from compressed air and holds the downstream pressure at your set point. This configuration is tapped 1/4 in NPT, carries the standard 40 um element and a manual drain, so the metal bowl is emptied by hand as part of routine checks. No gauge is fitted (code N), a reverse/check valve is included to hold the downstream setting if upstream pressure falls, and the mounting bracket is included. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR family is built in sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and the catalogue adds options such as automatic or differential-pressure drains, a finer 5 um element (code W), embedded square or external round gauges with MPa, psi or bar scales, G (BSPP) and NPT threads, and low-pressure or check-valve variants. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application.
| Model | GFR300C08MNTK AirTAC Filter Regulator 1/4 in NPT |
|---|---|
| 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 preparation for a machining centre's clamps, tool changer and air gates: the 40 um element strips water and particulate before they reach the valve stack, the regulator holds the pressure the cylinder circuit was set up for, and the built-in check valve keeps that setting if the main supply dips.
A filter regulator mounted on the frame of a form-fill-seal or cartoning machine, feeding its cylinders and air jets at a stable set point. The manual drain folds bowl-emptying into the end-of-shift routine, and the included bracket fixes the unit beside the machine's own valve block.
Conditioning instrument air for pneumatic sample valves and actuators in a process analyser shelter or lab gas panel: clean, dry air at a set pressure, with no lubricator in the body, so no oil mist is added upstream of sensitive instruments.
Work through the decodable choices in order. Size and port: this is a size 300 unit with a 1/4 in NPT port - step up to size 400 or 600 when the circuit's air demand outgrows the port. Drain: this model drains manually, which also gives the wider 0.05-0.9 MPa (7-130 psi) adjustment range; automatic and differential-pressure variants drain themselves but adjust from 0.15-0.9 MPa (20-130 psi). Filtration: 40 um is the standard element; choose the W code for 5 um where finer protection is needed. Gauge: none is fitted on this code, and gauged variants with MPa, psi or bar scales exist in the family. Thread: PT is the AirTAC standard, with G (BSPP) and NPT as order options - this unit is the NPT version. The bracket is included. Because AirTAC publishes flow as curves rather than a single rating, ask us to confirm sizing against the datasheet before you order.
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 line pressure, set pressure and air demand, and we will confirm the sizing against the datasheet curves before you order.
The bowl is emptied by hand during routine checks rather than automatically. On this manual-drain version the regulator adjusts from 0.05 to 0.9 MPa (7-130 psi); automatic and differential-pressure drain variants adjust from 0.15 to 0.9 MPa (20-130 psi). If you would rather not drain by hand, ask about the A (automatic) or blank (differential-pressure) drain codes in this family.
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.