The AirTAC GFR300-10 AirTAC Filter Regulator, G3/8, 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 size-300 filter regulator: water and particulate filtration plus pressure regulation combined in a single body. This configuration has a G3/8 (BSPP) port, a 5 um filter element (the finer W grade instead of the 40 um standard), an automatic drain that bleeds collected condensate without manual attention, an embedded square pressure gauge reading in psi, a built-in reverse/check valve, and a mounting bracket. The regulator is the standard type with an adjustment range of 0.15-0.9 MPa (20-130 psi), the maximum inlet pressure is 1.0 MPa (145 psi), and the working temperature range is -5 to 70 C (non-freezing). The bowl on this size is polycarbonate (PC).
This is a genuine AirTAC part from the GFR filter-regulator family, which spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 inch. Across the family you can order manual, automatic or differential-pressure drains, 40 um or 5 um elements, square or external round gauges with MPa, psi or bar scales, PT (standard), G or NPT threads, and bracket or no-bracket mounting. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application.
| Model | GFR300-10 AirTAC Filter Regulator, G3/8, 5 um, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (G (BSPP) 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 — square, 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 0.15 - 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Feeding clamping cylinders and fixtures on a CNC or manual machining cell: the 5 um element keeps swarf-laden supply air from fouling the clamps, the regulator holds a steady clamp pressure, and the check valve blocks reverse flow back toward the unit.
Conditioning air for carton sealers, case packers and pick-and-place cylinders on a packaging line, where the automatic drain handles condensate continuously and the psi gauge lets operators set and verify actuator pressure at a glance.
Supplying spray guns and air-assisted applicators in a finishing booth: the 5 um grade reduces particulate carryover into the finish, the regulator gives the operator direct control of atomising pressure, and the automatic drain keeps the bowl from loading up with water.
Pick the size and port by the air demand of the circuit downstream: the GFR300 with its 3/8 port sits mid-range in the family (200/300/400/600), one step up from the 1/4-inch size. Because flow is published as curves and not as a single rating, send us your demand and we will confirm sizing against the datasheet before you order. This unit already carries the finer 5 um element, the automatic drain, the psi-scale square gauge and the check valve; if you would rather have the 40 um standard element, a manual or differential-pressure drain, an MPa or bar gauge scale, or no check valve, those are orderable variants. Thread is G (BSPP) on this unit; PT is the catalogue standard and NPT is also available as an option. A mounting bracket is included.
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 rather than a single rated figure, so we do not quote a rated flow, Cv or SCFM number. Tell us the air demand and pressure of your application and we will confirm the sizing against the datasheet on request before you order.
This GFR300-10 carries the automatic drain (code A), which discharges collected condensate from the bowl without anyone opening it - useful on lines that run unattended. The family also offers manual drain (code M) and the differential-pressure drain (the default when no code is present), so you can order whichever suits the installation.
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.