The AirTAC GFR300-10 AirTAC Filter Regulator 3/8 in NPT, 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 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body, so one component does both jobs in the air-preparation position. This configuration is the size 300 unit with a 3/8 in NPT port, the low-pressure regulator type, a 40 um standard filter element, an automatic drain that ejects collected condensate without manual attention, an embedded square gauge reading in bar, and no mounting bracket. It is a genuine AirTAC part for compressed air only, with a maximum inlet pressure of 1.0 MPa (145 psi) and an operating temperature range of -5 to 70 C (non-freezing). The polycarbonate bowl suits the size 300 frame; only the size 600 units use an aluminium alloy bowl.
The GFR series is published in sizes 200, 300, 400 and 600, with ports from 1/8 in to 1 in, a choice of 40 um or 5 um (code W) filtration, differential-pressure, automatic or manual drains, square or round gauges with MPa, psi or bar scales, and PT, G or NPT threads. The low-pressure regulator range for this variant is not published as a single figure, and flow is published as curves rather than a rating, so ask us to confirm both against your application before ordering.
| Model | GFR300-10 AirTAC Filter Regulator 3/8 in NPT, Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (NPT 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 — square, bar 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. |
| 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. |
| (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 cartoning or wrapping line, the GFR300-10 sits at the machine's air inlet, filtering water and scale from the shop supply and holding a steady reduced pressure to the sealing and folding cylinders. The automatic drain keeps the polycarbonate bowl clear through long shifts without an operator stopping by.
For a pick-and-place robot with pneumatic grippers, this unit conditions the branch feed to the end of arm: the 40 um element stops particulate reaching the gripper valves, and the low-pressure regulator holds the gentler circuit pressure the gripper needs, read directly on the bar-scale square gauge.
At a CNC machining centre, the GFR300-10 on the 3/8 in NPT supply line removes condensate and pipe scale before the machine's solenoid valves and air bearings see them, with the regulator holding the reduced pressure the tool-changer circuit was set up for.
Size and port set the air capacity: this is the size 300 frame with a 3/8 in NPT port, one step up from 1/4 in, so step up to size 400 if your circuit has grown beyond it. The drain choice matters in practice: the automatic drain fitted here empties the bowl on its own, the differential-pressure default drains only when the pressure drop is high enough, and a manual drain (code M) suits attended installations. The 40 um element fitted here is the standard grade; specify 5 um (code W) only where finer filtration is genuinely required. The square gauge reads in bar; psi and MPa scales and an external round gauge are alternatives. NPT is the thread here; PT is the catalogue standard and G is also orderable. No bracket is fitted (code J); a bracket is available.
Two honest notes before you order: the low-pressure regulator variant does not have a published adjustment range, and flow for the GFR series is published as curves rather than a single rated figure. Ask us to confirm both from the datasheet 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 number, so we will not quote you a figure that is not in the catalogue. Send us your application details and we will confirm the flow from the datasheet curves, and the regulator's adjustment range for this low-pressure variant, before you order.
The A in the code GFR30010ALJF3T means the bowl drains itself automatically, so collected condensate is expelled without anyone opening the drain - useful on unattended or hard-to-reach installations. The series also offers the differential-pressure drain as the default and a manual drain (code M); the trade-off is simply how much attention the bowl gets.
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.