The AirTAC GFR300-10 NPT3/8 AirTAC Low-Pressure Filter Regulator 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 body that removes water and particulate from compressed air and then regulates downstream pressure. This configuration is built for a low-pressure application, with the regulator set up as the low-pressure type. It carries a 5 um filter element for finer particulate capture than the standard 40 um grade, an automatic drain that expels collected condensate from the PC bowl without manual attention, an embedded square gauge scaled in MPa for direct setting, and a 3/8 in NPT port. No mounting bracket is included and no reverse/check valve is fitted.
This is a genuine AirTAC part in the GFR300 size family, which spans sizes 200 to 600 with port options from 1/8 in to 1 in and PT, G or NPT threads. Drain type, filter grade, gauge style and scale are all selectable. We do not publish a single rated flow figure - flow is given as curves - so ask us and we will confirm the datasheet and sizing for your application on request.
| Model | GFR300-10 NPT3/8 AirTAC Low-Pressure Filter Regulator |
|---|---|
| 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, 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. 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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) |
Feeding clamping cylinders on an assembly fixture where the circuit calls for a low set pressure: the 5 um element protects the valve train and the automatic drain keeps condensate out of the clamp circuit without daily blowdown.
Conditioning air ahead of carton-sealing and case-erector cylinders on a packaging conveyor, where the automatic drain handles moisture carryover from a long supply run and the MPa gauge gives operators a clear setpoint.
Supplying a small bench-mounted punch or forming tool that runs at reduced pressure, with the low-pressure regulator holding the setting and the 3/8 in NPT port matching the drop from the shop main.
Size the unit by port step against the air demand of the circuit: the GFR300 here takes a 3/8 in NPT port, and the family steps through 200/300/400/600 with larger ports for higher flow. If your line pressure sits below the standard regulator band, this low-pressure type is the correct choice; the exact adjustment range for the low-pressure variant is not published, so confirm it with us. The 5 um element (code W) suits finer filtration; the 40 um standard element suits general-purpose protection. Drain options are automatic (fitted here), manual, or the default differential-pressure type. Gauge scales are available in MPa, psi or bar, and thread can be ordered as PT (standard), G or NPT. Flow is published as curves rather than a single rating, so have us 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 GFR300 as curves, not as a single rated figure, so we do not state a number. Send us your application details and we will confirm the flow curve and datasheet figures for this exact model on request.
This unit is fitted with the automatic drain (code A), which expels collected condensate without operator attention - useful on lines that are not blown down daily. The alternatives are the manual drain and the default differential-pressure drain; all three are orderable on the GFR300 family.
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.