The AirTAC AirTAC GFR300-08 Filter Regulator NPT1/4 5 um Auto Drain 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 automatic 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 GFR30008ALJNWTK is an AirTAC GFR300 filter regulator: a 5 um filter element and a pressure regulator combined in one body, sized for a 1/4 in NPT port. This configuration is the low-pressure type, so it suits circuits that are held at a lower regulated pressure than a standard unit; the exact set range is confirmed on request. The automatic drain bleeds collected water from the PC (polycarbonate) bowl without manual attention, and the fitted reverse (check) valve helps hold downstream pressure if the upstream supply drops. No gauge is fitted and no mounting bracket is included.
This is a genuine AirTAC part. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing). The G-series covers sizes 200 to 600 with ports from 1/8 to 1 in, a choice of differential-pressure, automatic or manual drain, 40 um standard or 5 um (W) filtration, gauge options, and PT, G or NPT threads. Rated flow is published as curves rather than a single figure, so ask us to confirm flow and datasheet details for your application before ordering.
| Model | AirTAC GFR300-08 Filter Regulator NPT1/4 5 um Auto Drain |
|---|---|
| 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 | Low-pressure 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Not fitted |
| 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. The low-pressure type adjusts over a lower band than standard; we confirm the exact figures from the factory datasheet. 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". |
| A | Drain: Automatic drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 130 psi)). |
| L | Low-pressure 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. |
| 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeds clamp and actuator circuits on a packaging machine that runs at a lower regulated pressure than the plant header, with the 5 um element protecting the control valves from water and particulate.
Supplies a robotic pick-and-place cell tapped off a shared plant header; the fitted check valve helps keep the cell's regulated pressure from bleeding back when the header pressure dips.
Filters and regulates air to gate and diverter cylinders on a conveyor line, with the automatic drain keeping condensate out of the valves during continuous shifts without operator attention.
Size the unit by port and expected air demand: each G-series size step (200/300/400/600) raises both the port and the flow capacity, so match the 1/4 in NPT port on this unit against what the circuit actually consumes. Choose the drain to suit maintenance: automatic (this unit) empties the bowl on its own, manual needs a scheduled drain, and the default differential-pressure type drains on the pressure drop. Filtration here is 5 um; the standard grade is 40 um if the downstream equipment tolerates coarser air. Gauge, bracket and thread (PT standard; G and NPT to order) are all decodable options. Flow is published as curves, not a single rated figure, so 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. The reflux valve permits reverse flow 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 one number. Send us your required flow and line pressure and we will confirm from the datasheet whether this 1/4 in, 5 um, low-pressure configuration suits your application.
The L in the code marks the low-pressure regulator type, intended for circuits held at a lower set pressure than the standard GFR300. Its exact adjustment range is not published in the material we hold, so we confirm it on request. Maximum inlet pressure is 1.0 MPa (145 psi), and since no gauge is fitted, specify a gauge option if you need a visible setting.
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.