The AirTAC AirTAC GFR300-08 Filter Regulator 1/4in PT 5um Manual 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 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 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is built on the 300 size with a 1/4 in PT port, the finer 5 um filter element, a manual-drain polycarbonate bowl, an external round gauge reading in psi, and a built-in reverse/check valve; it is supplied without a mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi), the working temperature range is -5 to 70 C (non-freezing), and with manual drainage the regulator adjustment range is 0.05-0.9 MPa (7-130 psi).
This is a genuine AirTAC part. The GFR series spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and offers choices of drain type, 40 um or 5 um filtration, gauge style and scale (MPa, psi or bar), thread (PT standard; G and NPT as order options) and bracket. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| Model | AirTAC GFR300-08 Filter Regulator 1/4in PT 5um Manual Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (PT 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 — round, psi 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. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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 clean, regulated air to the sealing and clamping cylinders of a carton wrapper or case packer, with the 5 um element helping protect the machine's directional valves from water and particulate carryover.
Conditions the air feeding spray guns in a finishing booth: the regulator sets a steady gun pressure while the 5 um grade and water removal help protect surface finish from contamination.
Supplies the clamping and tool-change circuits of a CNC machining centre, where the check valve helps hold the set downstream condition and the regulator keeps clamp pressure consistent between cycles.
Step through size and port against demand: the GFR series runs 200, 300, 400 and 600 with ports from 1/8 to 1 in, and this unit sits at 300 with a 1/4 in PT port. Drain type is a real operating choice - manual drain needs periodic bleeding to purge condensate, while automatic and differential-pressure drains discharge on their own; the code here specifies manual. Filtration is 5 um on this unit versus the 40 um standard, so choose it where downstream valves and cylinders need cleaner air. The gauge is the external round type on the psi scale (MPa and bar scales are also available), and the K code adds a reverse/check valve. Thread is PT as standard with G (BSPP) and NPT as order options, and this configuration omits the mounting bracket. Because flow is published as curves rather than a single rating, send us your application details and we will 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes G-series flow as curves rather than a single rated figure, so there is no one number we can honestly quote. Tell us your line pressure and the flow your application needs, and we will confirm the datasheet curve for this 300-size, 1/4 in unit before you order.
The bowl collects water and the 5 um element catches particulate; with a manual drain, an operator periodically opens the drain to purge the collected condensate. If unattended draining is preferred, the same GFR300 body is available with automatic or differential-pressure drains - just ask for that code 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.