The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 5 um 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 GFR300-08MLC1WTK 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 threaded 1/4 in NPT, carries the 5 um filter element (code W), drains condensate by hand through its manual drain, and is the low-pressure (L) type for circuits that run below the standard regulator range. It is supplied with a round pressure gauge scaled in MPa, a mounting bracket, and a reverse/check valve is fitted. The polycarbonate (PC) bowl lets you see the condensate level, and maximum inlet pressure is 1.0 MPa (145 psi) with a working temperature of -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, PT, G or NPT threads, drain choices of differential-pressure (default), automatic or manual, 40 um standard or 5 um (W) filtration, and gauge options. On this family only size 600 uses an aluminium alloy bowl; the 300 size is PC. Flow is published as curves rather than a single rated figure, so ask us to confirm the figures from the datasheet for your application before you order.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 5 um Manual Drain |
|---|---|
| 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 | 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, MPa 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. |
| 1 | Gauge scale: MPa. 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) |
Feeding spray guns on a paint or coating line that run at reduced pressure: the 5 um element keeps moisture and particles out of the finish, the manual drain is emptied between shifts, and the round MPa gauge lets an operator set and verify the gun supply pressure.
Supplying low-pressure clamping fixtures on a CNC cell where over-pressure could mark the workpiece: the low-pressure type regulates below the standard range, the reverse/check valve helps hold the set pressure, and the bracket fixes the unit to the cell frame.
Running the small cylinders that push cartons between conveyor lanes: filtered, regulated air at the low pressures these actuators use, with the 1/4 in NPT port matching the supply drops and the manual drain serviced during planned line stops.
The real choices on this family: step between sizes 200/300/400/600 to match port and flow; pick the drain - differential-pressure (default), automatic, or manual as fitted here; choose 40 um standard or 5 um (W) filtration, as on this unit; select gauge scale MPa, psi or bar; and specify thread PT (the standard), G or NPT. A J code removes the bracket; this unit includes one. Because this is the low-pressure (L) type, it is intended for regulated pressures below the standard range - the exact range for this variant is not published, so confirm it with us. Flow is published as curves, not a single rated figure, so send your pressure and flow requirements 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 the GFR family as curves rather than a single rated figure, so we do not quote a number here. Tell us your working pressure and required flow and we will confirm the figures from the datasheet - and check that the 300 size and 1/4 in NPT port suit your line - before you order.
M is the manual drain: condensate collected in the PC bowl is drained by hand on a schedule you set. If that does not suit your installation, the family also offers automatic (A) and differential-pressure (default) drains. On this specific unit, W is the 5 um element, L is the low-pressure regulator type, C1 is the round gauge scaled in MPa, T is the NPT thread, and K means a reverse/check valve is fitted; the bracket is included.
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.