The AirTAC AirTAC GFR300-10 Filter Regulator NPT 3/8 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 GFR300-10MLC3TK is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This size 300 unit is fitted with a 3/8 in NPT port, a manual drain bowl in polycarbonate, a 40 um standard filter element, and a low-pressure regulator type for applications that work below standard line pressure. It carries a round external gauge with a bar scale, a built-in reverse (check) valve to hold downstream settings when upstream air is lost, and a mounting bracket for panel or wall fixing.
This is a genuine AirTAC part from the GFR300 series. The GFR line spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, and options including automatic or differential-pressure drains, a 5 um (W) filter element, gauge scale choices and G or NPT threads. Flow figures for this series are published as curves rather than a single rating, so ask us and we will confirm the datasheet figures for your application on request.
| Model | AirTAC GFR300-10 Filter Regulator NPT 3/8 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (NPT 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 — round, bar scale |
| Reflux valve | Fitted (reverse flow permitted) |
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. |
| (blank) | Mounting bracket included. |
| (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. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| T | NPT thread. PT is the default; G is BSPP and T is NPT. |
| K | Reverse-flow (reflux) valve fitted. |
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) |
Fixture clamps that must close gently rather than at full line pressure are fed through this unit: the low-pressure regulator sets the clamp force, the 40 um element keeps spool and seal dirt out, and the check valve holds the clamp setting if the main supply drops.
On a packaging line where cylinders and actuators run at reduced pressure, one GFR300 filter regulator conditions and regulates the branch feeding the actuator bank, with the bar gauge giving the operator a visible setpoint and the bracket mounting it beside the machine manifold.
A workbench blow-off or part-cleaning station fed at reduced pressure gets filtered, regulated air from this unit: the manual drain lets the operator clear accumulated condensate at shift start, and the 40 um element protects the nozzle and fittings from pipe scale and water.
Start with the port step: this unit is 3/8 in NPT in the size 300 body, so match it to your line size and the flow your circuit needs - we confirm sizing against the published curves before you order. Because the regulator here is the low-pressure type, it suits circuits set below standard working pressure; the exact adjustment range is not published, so ask us to confirm it. The manual drain means an operator opens the bowl drain periodically - choose the automatic or differential-pressure drain variant instead if the unit sits where nobody passes regularly. The 40 um element is the standard grade; specify the W variant if you need 5 um filtration. The round gauge reads in bar; MPa and psi scales are available, and an embedded square gauge is the standard alternative. NPT is the thread on this unit; G (BSPP) is the other order option. A mounting bracket is included.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. The reflux valve permits reverse flow 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 number, so we do not quote a figure here. Tell us your line pressure and the flow your application needs, and we will confirm the datasheet curve values for this exact model on request before you order.
The M in the code selects the manual drain: an operator opens the bowl drain to remove collected condensate, which suits stations that are visited regularly. The L selects the low-pressure regulator type for circuits set below standard line pressure - its exact adjustment range is not published, so ask us to confirm it. Both are order-time choices: automatic or differential-pressure drains and the standard regulator type are available on other variants of the GFR300.
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.