The AirTAC GFR300-10 AirTAC Filter Regulator 3/8 NPT, 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: one size-300 body that removes water and particulate from compressed air and holds downstream pressure at your set point. This configuration has a 3/8 in NPT port, the 5 um filter element (the finer of the two published grades), an automatic drain that ejects collected condensate without anyone opening it, and an embedded square gauge scaled in bar. It is the low-pressure regulator type; the exact setting window for this variant is not published, so confirm it against your set point with us. A reverse/check valve is fitted to hold downstream pressure if the supply drops, a mounting bracket is included, maximum inlet pressure is 1.0 MPa (145 psi), and the operating temperature is -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 in to 1 in, in PT (the catalogue standard), G and NPT threads, with manual, automatic or differential-pressure drains, 40 um or 5 um elements, gauge and scale choices, and an optional reverse/check valve. Flow for this family is published as curves rather than a single rated figure, so ask us to confirm sizing and any datasheet figure against your application before ordering.
| Model | GFR300-10 AirTAC Filter Regulator 3/8 NPT, 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 | 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, bar 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. |
|---|---|
| 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)). |
| L | Low-pressure type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (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. |
| 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 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
On a paint line, each HVLP spray gun needs air that is free of water and grit and held at a steady, moderate pressure. This filter regulator cleans the supply, drains condensate automatically between shifts, and lets the operator read the bar-scale gauge at a glance.
A laboratory or QC test bench running low-pressure air tests benefits from fine 5 um filtration and a regulator intended for lower set points, with the reverse/check valve holding the circuit steady if shop air dips mid-test.
On a packaging line, the cylinders that fold, tuck and seal cartons need clean, dry, regulated air to stroke consistently. This unit filters the supply for the machine's valves, regulates it at a low set point, and its automatic drain keeps moisture out of the actuator air without daily attention.
Size 300 with a 3/8 in port sits mid-range in the GFR family; step down to 200 or up to 400/600 depending on the flow your line needs - we will read the published flow curves with you rather than guess from a single rating. This unit already carries the 5 um element (code W), automatic drain, low-pressure regulator, square bar-scale gauge and reverse/check valve; the alternative decodable choices are the 40 um standard element, manual or differential-pressure drain, MPa or psi gauge scales, and no reverse valve. Thread here is NPT; PT is the catalogue standard and G is also available to order. Bracket included. If your set point falls outside the standard regulation band, confirm the low-pressure type's exact range with us before ordering.
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, not as a single rated figure, so we do not quote a number here. Send us your required flow and working pressure and we will confirm from the datasheet whether size 300 with a 3/8 in port suits your application.
The automatic drain on this unit ejects collected condensate on its own, which suits unmanned cells, hard-to-reach mounts or shifts with no dedicated operator. The manual drain needs someone to open it periodically, and the differential-pressure drain (the family default) responds to the pressure drop across the bowl. All three drain types are orderable within the same GFR300 size.
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.