The AirTAC GFR300-08 AirTAC Filter Regulator 1/4 in NPT, 5 um is a genuine G-series filter regulator: water separation, 5 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT1/4" 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 GFR300-08 is a 300-size filter regulator that cleans compressed air and sets downstream pressure in a single body. This configuration is built with a 1/4 in NPT port, a 5 um filter element for finer particulate and water removal than the standard 40 um grade, and a differential-pressure drain that automatically clears collected condensate as the pressure differential across the bowl rises. No gauge is fitted and no mounting bracket is included, so it suits installations where a panel or machine surface already provides support and pressure is read elsewhere on the line.
This is a genuine AirTAC part. The GFR300 series shares a common design with sizes 200, 400 and 600, so you can scale port size and flow capacity within the same family as your air demand grows, with options including automatic or manual drains, gauge variants and PT or G thread on request. Flow is published as curves rather than a single rating, so contact us and we will confirm the datasheet figures for your application.
| Model | GFR300-08 AirTAC Filter Regulator 1/4 in NPT, 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 5 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 | Not fitted |
| 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. |
|---|---|
| 08 | Port size PT1/4". 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. |
| J | Supplied without bracket. |
| N | No pressure gauge (N). |
| (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. |
| W | Filtering grade 5 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 · PT1/4" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Mounted at the drop feeding a packaging machine's pneumatic cylinders, it strips water and fine particles from the shop air and holds a steady working pressure so sealing and case-packing motions stay repeatable through the shift.
Installed at a machine-side air drop in a fabrication shop, it cleans the compressed air feeding hand-operated clamps and small actuators and lets the operator set a stable regulated pressure for the tooling on that bench.
Placed ahead of lab pneumatic equipment that is sensitive to moisture carryover, the 5 um element polishes the supply and the regulator sets the gentle, stable pressure such instruments need, with condensate draining automatically.
Choose the 300 size with its 1/4 in NPT port when your line plumbing is 1/4 in and your air demand sits in the mid range of the G-series ladder; step up to 400 or 600 for larger flows, or down to 200 for compact drops. The 5 um element (code W) is the right pick when downstream valves and cylinders need finer protection than the standard 40 um grade. This unit has no gauge fitted (code N), so plan pressure readout elsewhere, and no bracket (code J), so confirm your mounting arrangement. The differential-pressure drain is the default and needs no operator attention; if your usage pattern differs, automatic or manual drain variants exist in the family.
Flow for this series is published as curves, not a single rated figure, so please ask us to confirm sizing against your application before ordering. PT is the standard thread across the range; G and NPT are catalogue options you order by suffix, as this NPT unit does.
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 characteristic curves rather than a single rated number, so there is no one figure we can honestly quote. Tell us your inlet pressure and the flow your application needs, and we will confirm the sizing from the datasheet curves before you order.
The W in the code GFR30008JNWT selects the 5 um filter grade instead of the standard 40 um element, giving finer protection for downstream equipment. The N selects no gauge, so pressure is read elsewhere on your line; gauge variants are available in the GFR300 family if you later want a local readout.
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.