The AirTAC GFR300-08 NPT1/4 AirTAC Filter Regulator, 5 um, Bar Gauge 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 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 300-size filter regulator that removes water and particulate from compressed air and sets a stable downstream pressure in one body. This configuration carries a 1/4 in NPT port, a 5 um filter element for finer filtration than the standard 40 um grade, a manual drain for the bowl, an embedded square gauge scaled in bar, and a standard regulator with a 0.05-0.9 MPa (7-130 psi) adjustment range. It ships without a mounting bracket. 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 available in sizes 200, 300, 400 and 600 with a choice of port, thread (PT standard, G and NPT as order options), drain type (differential-pressure, automatic or manual), filter grade (40 um standard, 5 um optional), gauge scale and bracket. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application on request.
| Model | GFR300-08 NPT1/4 AirTAC Filter Regulator, 5 um, Bar Gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 5 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 — square, bar 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 0.05 - 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). |
| F | Gauge shape: Square. C is round, F is square. |
| 3 | Gauge scale: bar. 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) |
Clean, regulated air for the workpiece-clamp and tool-change cylinders on a CNC machining center, where the 5 um element helps protect sensitive clamping valves and the bar gauge gives the setter a direct pressure readout.
Supplying filtered, pressure-set air to the pick-and-place cylinders and vacuum ejectors on a bottling or cartoning conveyor, with the manual drain bled during scheduled line cleaning.
A point-of-use filter regulator at an assembly bench in a general manufacturing plant, conditioning the air feeding hand tools and small actuators before it reaches the workstation.
Start with the size and port: 200, 300, 400 and 600 step up in port and flow capacity, so match the size to the air demand of the circuit rather than to the pipe alone. This unit is the 300 size with a 1/4 in NPT port. Choose the drain type next: manual drain (this unit) needs periodic bleeding by an operator, while automatic and differential-pressure drains handle condensate without attention. Pick the filter grade to suit the downstream equipment: 40 um is the standard element and 5 um (code W, fitted here) suits finer applications. Select the gauge scale - MPa, psi or bar (bar on this unit) - and decide between the embedded square gauge and the optional external round gauge. Specify the thread to match your piping: PT is the standard, with G (BSPP) and NPT as catalogue options. Brackets are optional on GFR units; this one is ordered without.
Flow for this family is published as curves, not as a single rated figure, so please 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 GFR family as curves rather than a single rated figure, so we do not quote one number. Tell us your application and we will confirm the relevant flow and datasheet figures for the GFR300-08 on request before you order.
The M in the code GFR30008MJF3WT specifies a manual drain, so condensate collected in the bowl is released by hand at intervals. If you prefer unattended operation, the same 300-size GFR unit can be ordered with an automatic drain (code A) or a differential-pressure drain (blank) instead.
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.