The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4, Bar Gauge 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 PT1/4" 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 GFR300-08 is a size-300 filter regulator: it removes water and particulate from compressed air and sets downstream pressure in a single body. This configuration is threaded NPT1/4 (1/4 in), carries a 40 um filter element, and drains by hand through its manual drain - you open the drain valve when you choose, which suits installations where an automatic bleed is not wanted. The round gauge fitted to this unit reads in bar, and a reverse (check) valve is fitted so downstream pressure is held if the upstream supply drops. The polycarbonate bowl is rated to the family maximum inlet pressure of 1.0 MPa (145 psi), and the unit operates from -5 to 70 C (non-freezing). No mounting bracket is included with this code.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 inch and a choice of PT, G (BSPP) or NPT threads. Other options in the series include automatic or differential-pressure drains, a 5 um element (code W), square or round gauges with MPa, psi or bar scales, and a low-pressure regulator type. Flow is published as curves rather than a single rated figure, so ask us and we will confirm the flow and datasheet figures for this model against your application.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4, Bar Gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (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 — round, 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. |
|---|---|
| 08 | Port size PT1/4". 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). |
| C | Gauge shape: Round. 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 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeds filtered, regulated air to the clamps and tool-change cylinders on a CNC machining cell, with the bar gauge letting the setter read set pressure directly and the check valve holding clamp pressure if the main supply dips.
Sits at the drop of a packaging machine's air supply, cleaning water and scale out of the air before it reaches the sealing and carton-eject cylinders and holding the working pressure the cycle was tuned to.
Provides a clean, adjustable air supply to bench-top test rigs and lab pneumatic fixtures, where the manual drain suits intermittent use and the 40 um element protects sensitive instruments from water and particulate carryover.
Size the GFR series by stepping up through 200, 300, 400 and 600: larger sizes take larger ports and move more air, so match the port (here NPT1/4) and the size step to the flow your line needs. Because flow is published as curves and not as a single rating, ask us to confirm sizing against your application before ordering. On drain choice: manual (this unit) drains only when opened, automatic drains continuously, and the default differential-pressure drain bleeds with flow - pick manual only where someone can reliably open the bowl drain. Filter grade is 40 um as standard; specify code W for the 5 um element if downstream equipment needs finer filtration. Gauges come as an embedded square gauge or an external round gauge with MPa, psi or bar scales (this unit: round, bar). Thread is PT as the catalogue standard, with G (BSPP) and NPT as order options; brackets are optional (this code has none), and code K adds a reverse/check valve.
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.
AirTAC publishes flow for the GFR series as curves rather than a single rated figure, so there is no one rated flow number we can state for this model. Tell us your application and required flow, and we will confirm the figures from the datasheet and check that the size-300, NPT1/4 configuration suits it before you order.
The M in the code means the bowl is drained by hand: someone opens the drain valve to expel collected water. Choose automatic drain (code A) if the unit is on a line nobody regularly attends, or the default differential-pressure drain where bleeding with flow is acceptable. Manual is fine for machines that are checked as part of a routine, and it avoids any continuous bleed of air.
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.