The AirTAC GFR300-10 AirTAC Low-Pressure Filter Regulator, G3/8 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 low-pressure filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is built on the 300 size with a G3/8 (BSPP) port, carries a 5 um filter element for finer filtration than the standard 40 um grade, and has an automatic drain that expels collected condensate without manual attention. It is the low-pressure type, intended for circuits that run below the standard regulator range, and the embedded square gauge (psi scale) lets you read the set pressure directly. No mounting bracket is supplied and no reverse/check valve is fitted.
This is a genuine AirTAC part from the GFR series, which spans the 200, 300, 400 and 600 sizes with port options from 1/8 in to 1 in, a choice of automatic, manual or differential-pressure drains, 40 um or 5 um filtration, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so we confirm the datasheet figures for your application on request.
| Model | GFR300-10 AirTAC Low-Pressure Filter Regulator, G3/8 |
|---|---|
| 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 | 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, psi 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. |
| 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. |
| (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 a carton-sealing or wrapping machine section that runs on low-pressure air, where the 5 um element protects downstream valves and the automatic drain keeps condensate out of the line during continuous shifts.
Conditioning the air supply to a lab bench or test rig that needs fine filtration and a stable, low regulated pressure, with the psi-scaled square gauge giving a direct reading of the set point.
Filtering and regulating the air feeding a spray gun or coating line, where the 5 um grade helps keep moisture and fine particles out of the finish and the automatic drain handles condensate without daily attention.
Choose the size and port step against the air demand of the circuit: the 300 size with its 3/8 in port sits in the middle of the GFR range, with 200, 400 and 600 available when smaller or larger flow paths are needed. This unit is the low-pressure (L) type, so select it where the working pressure stays below the standard regulator range; for circuits needing the full standard adjustment span, the non-L GFR300 variants are the alternative. The 5 um (W) element suits applications sensitive to fine particulate; the 40 um standard grade remains available if coarser filtration is acceptable. The automatic drain (A) suits unattended installations; manual and differential-pressure drains are the other catalogue options. The fitted square gauge reads in psi, with MPa and bar scales and an external round gauge as alternatives. Thread here is G (BSPP); PT is the standard thread and NPT is an order option. Because flow is published as curves rather than a single rating, 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, not as a single rated figure, so we do not quote a number here. Tell us your application and operating pressure and we will confirm the relevant flow and datasheet figures on request before you order.
The A in the code means the bowl drains itself automatically, which suits installations that are not checked daily; manual and differential-pressure drains are the other options in the series. The W code selects the 5 um element instead of the 40 um standard grade, for finer protection of downstream equipment. Both choices are pure specification options - order the code that matches your circuit.
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.