The AirTAC GFR300-08 AirTAC Filter Regulator PT1/4, 40 um, Manual Drain 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 PT1/4" 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 GFR300-08 is a filter regulator: it removes water and particulate from compressed air and holds downstream pressure steady in a single body. This configuration is the 300 size with a 1/4 in PT port, a 40 um standard filter element, a manual drain bowl in polycarbonate, and an embedded square gauge scaled in psi. The standard regulator covers 0.05-0.9 MPa (7-130 psi), and the unit is rated to 1.0 MPa (145 psi) maximum inlet and -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR series spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, PT, G or NPT threads, manual, automatic or differential-pressure drains, and a 5 um (W) element option. We confirm flow and other datasheet figures on request - flow is published as curves rather than a single rating.
| Model | GFR300-08 AirTAC Filter Regulator PT1/4, 40 um, Manual Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (PT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, 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. Standard type, regulating 0.05 - 0.9 MPa (7 - 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 130 psi)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Point-of-use air preparation ahead of spray guns and air cylinders, where clean, dry, steady-pressure air protects finish quality.
Conditioning the air feed to pneumatic clamps and tool changers so clamp pressure stays consistent part after part.
Feeding diverters, sealers and stopper cylinders on conveyor and cartoning lines with filtered, regulated plant air.
Step up or down a size (200/300/400/600) to match the port and the flow your line needs - the 300 size carries a 1/4 in PT port here. Choose the drain: manual (this unit, with the widest 0.05-0.9 MPa / 7-130 psi setting range), automatic for unattended condensate removal, or differential-pressure as the default. The 40 um element suits general plant air; specify the W code for the 5 um option when finer filtration is needed. The square gauge is fitted in psi here; MPa or bar scales and an external round gauge are options. PT is the standard thread - order G (BSPP) or NPT if your piping needs it - and a mounting bracket is included.
Flow is published as curves, not 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. Without the K option, air cannot flow back through the unit. A filter regulator adds no oil to the line.
AirTAC publishes GFR flow as curves, not a single rated figure, so we do not quote a number here. Send us your line pressure and air demand and we will confirm the sizing from the datasheet on request.
This unit has a manual drain: condensate is released by opening the drain valve, and the manual-drain version carries the widest regulation range, 0.05-0.9 MPa (7-130 psi). Choose it for attended installations; choose automatic or differential-pressure drain for unattended duty.
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.