The AirTAC GFR300-10 NPT3/8 AirTAC Filter Regulator, 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 PT3/8" 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 AirTAC GFR300-10 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the 300 size with a 3/8 in NPT port, a 5 um filter element (the W grade, finer than the standard 40 um), an automatic drain that ejects collected condensate without manual attention, and a round pressure gauge with an MPa scale. The regulator is the standard type with an adjustment range of 0.15-0.9 MPa (20-130 psi), no reverse/check valve is fitted, and no mounting bracket is included. The bowl on this 300 size is polycarbonate (PC).
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with a choice of ports, drain types, filter grades, gauge styles and scales, and G, NPT or PT threads. Because flow is published as curves rather than a single rating, we confirm flow and other datasheet figures for your application on request.
| Model | GFR300-10 NPT3/8 AirTAC Filter Regulator, 5 um, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, MPa 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 0.15 - 0.9 MPa (20 - 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. |
|---|---|
| 10 | Port size PT3/8". 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)). |
| (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. |
| 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. |
| (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 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Conditioning the shop-air feed to a CNC machining center's pneumatic tool-changer and clamping circuits: the 5 um element protects fine valves from particulate and water while the regulator holds a steady set pressure.
Supplying cleaned, regulated air to the cylinders and diverters on a packaging and cartoning conveyor line, where the automatic drain keeps condensate off the actuators during continuous shifts.
Feeding a laboratory pneumatic test bench where a fine 5 um grade and a closely held regulated pressure are wanted for repeatable instrument and component checks.
Size and port are the first choice: step up through 200, 300, 400 and 600 as your port size and air demand grow - this unit sits at 300 with a 3/8 in NPT port. Drain type is a real decision: automatic drain (fitted here) suits unattended duty; manual or differential-pressure drains are the alternatives. Filter grade is 40 um standard or 5 um (code W) for finer protection - this unit carries the 5 um element. The gauge can be the embedded square type or an external round gauge, with MPa, psi or bar scales; here it is a round gauge on MPa. Thread is PT as standard, with G (BSPP) and NPT as orderable options - this unit is NPT. A mounting bracket is optional (not fitted on this code).
One honest note before you order: 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. 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 series as curves rather than a single rated figure, so we do not quote a rated flow number. Tell us your application and we will confirm the flow and sizing from the datasheet on request.
The automatic drain ejects collected condensate on its own, so the bowl does not need manual draining - useful on lines that run unattended. The 5 um element (code W) is finer than the 40 um standard grade, giving better protection for downstream valves and instruments.
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.