The AirTAC GFR300-10 AirTAC Filter Regulator, PT3/8, 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 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: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the low-pressure type, suited to circuits that run at reduced set pressures, with a PT3/8 (3/8 in) PT thread, a 40 um standard filter element, an automatic drain that expels collected condensate without manual attention, and an external round gauge reading in psi. The polycarbonate bowl lets you see the condensate level at a glance, and the unit is ordered without a mounting bracket.
This is a genuine AirTAC part from the GFR range, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of automatic, manual or differential-pressure drains, a 5 um (code W) element option, gauge style and scale choices, and G or NPT thread options to order. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet and sizing figures for your application.
| Model | GFR300-10 AirTAC Filter Regulator, PT3/8, Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (PT thread) |
| Filtering grade | 40 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 — round, 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). |
| C | Gauge shape: Round. 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. |
| (blank) | PT 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) |
On a fixture-clamping circuit that holds workpieces at a reduced set pressure, the GFR300-10 filters the supply air and holds the regulated pressure, with the psi round gauge giving the operator a direct reading at the clamp panel.
Feeding a packaging machine's valve island and air cylinders, this filter regulator removes water and 40 um particulate ahead of the valves, while the automatic drain keeps condensate off the bowl during long production runs.
On a food-plant line where pneumatic actuators divert product flow, the low-pressure type regulator sets the gentler operating pressure those actuators need, and the PT3/8 connection drops straight into the existing 3/8 in air drop.
Start with the port step: the 300 size with PT3/8 suits lines plumbed at 3/8 in, and larger sizes carry more flow - we confirm the exact curve against your demand before you order. This unit is the low-pressure type; if your circuit runs at ordinary shop-air set pressures, ask us which standard-type variant fits instead. The automatic drain suits unattended duty; choose manual where you prefer operator-controlled blowdown or differential-pressure where you want drain action tied to the pressure drop. The 40 um element is the standard grade; specify code W for the 5 um grade if downstream equipment needs finer filtration. The round psi gauge is fitted here; embedded square gauges and MPa or bar scales are alternatives. Thread is PT as standard, with G (BSPP) and NPT available as order options, and brackets can be added if this no-bracket version needs panel fixing.
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 series as curves, not as a single rated figure, so we do not quote a number that could mislead your sizing. Send us your application's flow and pressure demand and we will confirm the datasheet curve and check the fit before you order.
This configuration has an automatic drain, which discharges collected condensate from the polycarbonate bowl by itself as it accumulates - no operator blowdown needed. It is the usual choice for unattended or hard-to-reach installations; manual and differential-pressure drains remain available on other GFR300 variants if you prefer those.
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.