The AirTAC GFR300-08 AirTAC Filter Regulator, G1/4, 5 um, Manual 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 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: one body that removes water and particulate from compressed air and regulates downstream pressure. This configuration has a G1/4 (BSPP) port, the finer 5 um filtration grade, a manual-drain polycarbonate bowl, and a round pressure gauge reading in psi. Maximum inlet pressure is 1.0 MPa (145 psi), the operating temperature range is -5 to 70 C (non-freezing), and no mounting bracket or reverse/check valve is fitted.
This is a genuine AirTAC part in the GFR300 series, one of four sizes (200, 300, 400, 600) covering ports from 1/8 in to 1 in, with catalogue choices of drain type, 40 um or 5 um filtration, gauge style and scale, and thread. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR300-08 AirTAC Filter Regulator, G1/4, 5 um, Manual Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Filtering grade | 5 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 — round, 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. |
| J | Supplied without bracket. |
| (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. |
| G | G (BSPP) 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Air preparation for the cylinder and valve circuit on a bench press or riveting cell, where the 5 um element keeps grit out of valve seats and the regulator holds the working pressure the tooling was set up for.
Supplying atomising air to spray guns on a finishing line, where moisture and particles in the shop air would spoil the finish and steady downstream pressure keeps the spray pattern consistent.
Conditioned air for the diverters, pushers and clamp cylinders along a packaging conveyor, with the manual drain bowl emptied as part of the daily start-up check.
Size and port step up with air demand: GFR sizes 200, 300, 400 and 600 cover ports from 1/8 in to 1 in, and this unit sits at size 300 with a G1/4 port. Drain choices are differential-pressure (default), automatic or manual; this one is manual, which also gives the wider regulation range of 0.05-0.9 MPa (7-130 psi). Filtration is 40 um standard or 5 um with code W, fitted here. Gauges are an embedded square gauge or an external round gauge, scaled in MPa, psi or bar; this unit carries a round psi gauge. Thread is PT as standard with G and NPT as order options, and this unit is G (BSPP); a bracket is optional and not fitted here. 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 flow for the GFR300 series as curves rather than a single rated figure, so we do not quote a number here. Tell us your working pressure and air demand and we will confirm the datasheet flow curve for this 1/4 in filter regulator before you order.
The M in the code selects a manual drain bowl: condensate is emptied by hand rather than automatically. On a GFR unit with manual drain the regulation range is 0.05-0.9 MPa (7-130 psi), and the arrangement suits installations where someone is on site to do the check. Automatic and differential-pressure drains are available in the same size if you prefer unattended draining.
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.