The AirTAC AirTAC GFR300-10 Filter Regulator 3/8 NPT, 5 um, Auto Drain 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 combines water and particulate filtration with pressure regulation in a single 300-size body, so one component both cleans the air and holds your downstream pressure where the process needs it. This configuration is built for it: a 5 um filter element (code W) for finer contaminant capture than the standard 40 um grade, an automatic drain that ejects collected condensate without anyone opening the bowl, a low-pressure regulation type for circuits that run below standard regulator ranges, and a fitted reverse (check) valve that holds downstream pressure if the supply drops. It has a 3/8 in NPT port, no gauge is fitted, and a mounting bracket is included.
This is a genuine AirTAC part from the GFR filter-regulator line, which spans sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, PT as the standard thread and G or NPT as order options, plus drain, filter-grade, gauge and valve choices. Flow is published as curves rather than a single rated figure, so we confirm the datasheet and sizing figures for your application on request.
| Model | AirTAC GFR300-10 Filter Regulator 3/8 NPT, 5 um, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (NPT 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 | Not fitted |
| 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". |
| 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. |
| (blank) | Mounting bracket included. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Mounted at the drop to a clamping or light-press station, the unit cleans the supply to 5 um and holds a steady low regulated pressure to the cylinders, while the check valve keeps the circuit from dumping if the main supply dips mid-cycle.
On a packaging or bottling line where air nozzles blow debris off product or belts, the 5 um element protects the small nozzle orifices from water and particles and the regulator holds the blow-off pressure steady across the shift.
Feeding analytical instruments, sample-handling actuators or test rigs that run at reduced pressure, the low-pressure regulation type, fine 5 um filtration and automatic drain keep the supply clean and stable without daily bowl draining.
Size and port set the capacity envelope: the 300 size with a 3/8 in NPT port is the mid step of the GFR range, so step up to 400/600 or down to 200 depending on the flow your line draws. The 5 um element here suits points where finer particle and water carryover matter; the standard grade is 40 um if your application tolerates it. The automatic drain suits unattended or hard-to-reach installations, while manual and differential-pressure drains are the alternatives. A gauge is not fitted in this code, so plan your pressure indication separately if you need it. NPT is the ordered thread here; PT is the catalogue standard and G (BSPP) is also available. A mounting bracket is included.
One honest note before you order: AirTAC publishes flow for this family as curves, not a single rated number, and the exact regulation range of the low-pressure type is not a published figure either. Ask us to confirm both against your application before ordering.
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 family as curves rather than a single rated figure, so there is no one number we can honestly quote. Send us your application details and we will confirm the flow curve and sizing from the datasheet on request before you order.
In this code, A selects the automatic drain, which ejects collected condensate on its own so the unit suits unattended or hard-to-reach spots; manual and differential-pressure drains are the other catalogue choices. N means no gauge is fitted, so add pressure indication separately if your circuit needs it.
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.