The AirTAC GFR300-08 NPT1/4 AirTAC Filter Regulator 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 PT1/4" 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 GFR300-08 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This 300-size unit is supplied with 1/4 in NPT ports, a 5 um filter element (the finer of the two catalogue grades), an automatic drain that discharges collected condensate without manual attention, a round pressure gauge reading in psi, a reverse (check) valve, and a mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi), the standard regulator adjustment range for automatic-drain units is 0.15-0.9 MPa (20-130 psi), and the operating temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl suits this size; only the 600 size uses an aluminium alloy bowl.
This is a genuine AirTAC part. The GFR series spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, and is offered with a choice of drain type (differential-pressure, automatic or manual), filter grade (40 um standard or 5 um), gauge style and scale, thread form (PT standard, G and NPT to order) and bracket option. Flow is published as curves rather than a single rating, so we confirm the datasheet and sizing figures on request.
| Model | GFR300-08 NPT1/4 AirTAC Filter Regulator 5 um Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Standard 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 | 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). 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. |
|---|---|
| 08 | Port size PT1/4". 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)). |
| (blank) | Standard 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. |
| 2 | Gauge scale: psi. 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 · PT1/4" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeds filtered, regulated air to the tool-clamp and chip-clearing circuits of a small CNC machining centre, with the 5 um element and check valve protecting downstream valves between cycles.
Supplies regulated air to the stopper and pusher cylinders along a packaging conveyor line, with the automatic drain handling condensate from a compressor system that runs through shifts.
Serves as the point-of-use filter regulator at an assembly bench, giving operators a stable, gauge-monitored supply pressure for hand-held pneumatic tools and small clamps.
Start with the port step: GFR300 carries 1/4 in ports, one step up from the 200 size and below the 400 and 600 sizes, so match the size to the air demand of the circuit. Choose the drain: differential-pressure (default), automatic (as on this unit) or manual. Choose the filter grade: 40 um standard or 5 um (code W, as fitted here) where finer particulate removal is needed. Gauge options are the embedded square gauge or an external round gauge, with MPa, psi or bar scales - this unit carries a round psi gauge. Thread is PT as the catalogue standard, with G (BSPP) and NPT available as order options; this unit is NPT. A bracket is included (code J deletes it), and code K adds the reverse (check) valve fitted here. Flow is published as curves rather than a single rating, so ask us to confirm sizing 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 G-series flow as performance curves rather than a single rated figure, so we do not quote a rated flow number. Tell us your application and we will confirm the flow and sizing data from the datasheet on request.
Code A in GFR30008AC2WTK selects the automatic drain, which discharges collected condensate from the bowl without manual attention (the alternatives are the differential-pressure default drain or manual drain, code M). Code K fits a reverse (check) valve, which holds the downstream setting if upstream supply is interrupted. Both are catalogue options on the GFR series.
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.