The AirTAC GFR300-10 AirTAC Filter Regulator 3/8 in NPT, 5 um 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 differential-pressure 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 300-size body. This configuration is built with 3/8 in NPT ports, a 5 um filter element for finer filtration than the standard 40 um grade, a differential-pressure drain that bleeds condensate automatically as flow passes through, and a round pressure gauge with a bar scale. It is the low-pressure (L) regulator type, carries no reverse/check valve, and ships without a mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl lets you see the condensate level at a glance.
This is a genuine AirTAC part. The GFR filter-regulator family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, in PT (standard), G and NPT threads, with a choice of drain type, filter grade, gauge style and scale, and optional brackets. Flow is published in the catalogue as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing figures for your application before you order.
| Model | GFR300-10 AirTAC Filter Regulator 3/8 in NPT, 5 um |
|---|---|
| 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 | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, bar 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. 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". |
| (blank) | Drain: Differential-pressure 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. 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. |
| (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) |
On a CNC fixture that clamps with low-pressure air, the GFR300-10 filters chips-laden, wet shop air down to 5 um and holds the regulated pressure the clamp cylinders were designed for, with the bar-scale gauge giving the setter a direct reading at the fixture.
Packaging conveyor guide-rail and reject-gate actuators run on modest, stable pressure. This filter regulator conditions the 3/8 in branch feeding them, and the differential-pressure drain keeps condensate moving out during continuous-shift running.
Bottle-rinse blow-off and air-knozzle stations need clean, moisture-reduced air at reduced pressure. The 5 um element protects the nozzles from particulate, the polycarbonate bowl shows condensate build-up, and the low-pressure type regulator suits the reduced-pressure setting these stations run at.
Start with the port step: 300 size covers 3/8 in on this model, and the family steps 200/300/400/600 upward, so match the size to the air demand of the circuit rather than oversizing on price alone. This unit carries the 5 um (W) element - choose it when downstream valves, cylinders or instruments need finer filtration than the standard 40 um grade. The differential-pressure drain is the default: it passes condensate with the flow and suits steady-duty lines; a manual-drain or automatic-drain version can be selected if your duty cycle or bowl orientation calls for it. The round gauge on this code reads in bar; square embedded gauges and MPa or psi scales are the other catalogue choices. Thread is NPT here - PT is the standard thread and G is also available as an order option - and this code omits the mounting bracket, which can be ordered where panel or wall fixing is needed. Because flow is published as curves and not a single rating, 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. 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 in the catalogue, not as a single rated number, so we do not quote a figure here. Send us your line pressure, downstream demand and allowable pressure drop, and we will confirm the sizing from the datasheet on request before you order.
L marks the low-pressure type of regulator - a variant intended for reduced-pressure settings; its exact adjustment range is not published in the material we hold, so we confirm it on request. W marks the 5 um filter element, one grade finer than the 40 um standard. Other decodable choices on this unit are the 3/8 in NPT thread, the differential-pressure drain, the round bar-scale gauge, and no mounting bracket.
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.