The AirTAC GFR300-08 AirTAC Filter Regulator 1/4 in NPT 5 um 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 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is built with a 1/4 in NPT port, a 5 um filter element for finer filtration than the standard 40 um grade, a manual drain on the bowl, and a round pressure gauge reading in psi. The standard regulator covers an adjustment range of 0.05-0.9 MPa (7-130 psi), and maximum inlet pressure is 1.0 MPa (145 psi).
This is a genuine AirTAC part. The GFR300 series is one of four sizes (200/300/400/600) with port options from 1/8 in to 1 in, a choice of 40 um or 5 um filtration, manual, automatic or differential-pressure drains, and gauge scale choices in MPa, psi or bar. 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 1/4 in NPT 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT 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. |
| (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. |
| (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) |
Clean, regulated air for tool-clamp and pallet-actuation circuits on a machining centre, with 5 um filtration protecting tight-tolerance valves.
Filter-and-regulated air to carton-forming and sealing cylinders on a packaging line, with the psi gauge giving operators a direct setpoint readout.
Fine 5 um air conditioning for analytical instruments and test rigs where particulate carry-over must be kept low and pressure held steady.
Size and port set the flow path: the 300 size with a 1/4 in port suits compact supply lines, while larger sizes (400, 600) step up port and flow capacity. Choose the 5 um element when downstream equipment needs finer filtration than the standard 40 um grade. The manual drain on this unit means an operator opens the drain at intervals to remove collected condensate; choose automatic or differential-pressure drain codes if unattended draining is preferred. The round gauge is ordered in psi here, with MPa or bar scales also available. Thread is NPT on this code; PT (standard) and G are the other catalogue options. A mounting bracket is included. Because flow is published as curves rather than a single rating, 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, not as a single rated figure, so we do not quote a number. Tell us your application and we will confirm the flow and datasheet figures on request before you order.
The M in the code specifies a manual drain on the bowl: collected condensate is released by opening the drain by hand at intervals. If you prefer unattended draining, the same filter regulator is available with automatic (A) or differential-pressure (blank) drain codes.
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.