The AirTAC GFR300-10 AirTAC Filter Regulator G3/8 Low-Pressure is a genuine G-series filter regulator: water separation, 40 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT3/8" ports, a manual drain and regulates 0.05 - 0.9 MPa (7 - 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 body. This 300-size unit has a G3/8 (3/8 in) G-thread port, a 40 um standard filter element, a manual drain bowl in polycarbonate, and a low-pressure regulator type with an embedded square gauge scaled in psi. No reverse/check valve is fitted and no mounting bracket is included in this configuration.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, a choice of manual, automatic or differential-pressure drains, a 5 um optional element, gauge scales in MPa, psi or bar, and G or NPT thread variants to order. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application on request.
| Model | GFR300-10 AirTAC Filter Regulator G3/8 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (G (BSPP) thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 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. |
| (blank) | Filtering grade 40 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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Feeds filtered, pressure-controlled air to a paint spray gun station, where the low-pressure regulator type holds a gentle, steady setting and the 40 um element keeps water and dirt out of the finish.
Sits at the air drop feeding a carton-sealing or wrapping machine, cleaning the supply and letting an operator set and read the working pressure on the psi gauge.
Conditions the air feeding bench-top test rigs and pneumatic lab instruments, where the manual drain allows a controlled bleed-off between sessions and the compact 300 size fits tight panels.
Size and port step up together: 200 through 600 covers larger ports and more flow, so pick the size whose curve covers your air demand at the working pressure - we can confirm the curve on request. This unit is the low-pressure regulator type, so choose it where the controlled pressure sits at the lower end of the range; the exact range for this type is not published and we will confirm it for you. Drain is manual here, which suits points where an operator can bleed the bowl on a routine; choose automatic or differential-pressure drain where the unit is inaccessible. The 40 um element is the standard grade; specify the W code for 5 um where finer filtration is needed. The embedded square gauge is scaled in psi; MPa and bar scales and an external round gauge are alternatives. Thread is G in this code, with PT as the standard and G/NPT as order options, and this configuration has no bracket.
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 this series as curves, not as a single rated number, so we do not quote a figure. Tell us your line pressure and air demand and we will confirm the sizing against the datasheet curve on request.
The M in the code specifies a manual drain bowl: an operator opens it to discharge collected water. Choose manual where the unit is easy to reach and serviced routinely; choose automatic or differential-pressure drain where the unit is mounted out of reach. With a manual drain, the regulator adjustment range is the wider manual-drain range, and the exact range for this low-pressure type is confirmed on request.
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.