The AirTAC GFR300-08 AirTAC Filter Regulator, G1/4, 5 um, Low-Pressure 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 300-size unit is fitted with a G1/4 (BSPP) port, a 5 um filter element for finer filtration than the 40 um standard, a manual drain for emptying the PC bowl, the low-pressure regulator type, a round external gauge with psi scale, and a reverse/check valve that holds downstream pressure when the supply is lost. The mounting bracket is included. Maximum working (inlet) pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part from the G-series filter regulator line, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, a choice of 40 um or 5 um filtration, manual, automatic or differential-pressure drains, standard or low-pressure regulation, gauge and scale options, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm flow and datasheet figures for your application before ordering.
| Model | GFR300-08 AirTAC Filter Regulator, G1/4, 5 um, Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | 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. 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 130 psi)). |
| L | Low-pressure type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (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. |
| G | G (BSPP) 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) |
On a CNC machining cell where soft-jaw clamps or pallet hold-downs must close at a gentle, stable set pressure, this GFR300-08 filters the shop air to 5 um and regulates it in the low-pressure band, with the check valve holding the clamp position if the main supply drops.
On a carton-sealing or wrapping line, low-pressure air is needed for film tensioning, counting jets and gate actuation. This unit cleans the supply to 5 um, sets the reduced pressure with a psi gauge readable at the machine, and the manual drain suits a shift-based maintenance routine.
On a lab test bench or pilot rig running sensitive pneumatic instruments, the 5 um element protects fine components from water and particulate, the low-pressure regulator type suits circuits set well below standard line pressure, and the check valve prevents backfeed between bench stations.
Choose the 300 size with its 1/4 in port when your line sits in the middle of the G-series flow range; step up to 400 or 600 for larger demand, or down to 200 for compact circuits. This unit carries the 5 um (W) element, so pick it over the 40 um standard grade when downstream valves, cylinders or instruments need finer air. The manual drain (M) means an operator or maintenance round empties the bowl - choose automatic or differential-pressure drain codes instead if you want the bowl to clear itself. The low-pressure (L) regulator type is intended for circuits set below the standard adjustment range; the exact range for this type is not published, so confirm it with us. The round gauge is fitted with a psi scale (MPa and bar scales are the other options). Thread here is G (BSPP); PT is the standard thread and NPT is also an order option. Bracket is included.
Flow for this family is published as curves, not a single rated figure, so we do not quote a number here - 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 flow for this family as curves, not as a single rated figure, so we do not quote a number here. Send us your application details and we will confirm the flow figures from the datasheet so you can size the unit against your demand before ordering.
The L code makes this a low-pressure regulator type, intended for circuits set below the standard adjustment range; the exact range for this type is not published, so confirm it with us. The K code adds a reverse/check valve, which holds downstream pressure when the upstream supply is lost. This unit also has a manual drain, so the bowl should be emptied as part of a scheduled maintenance round.
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.