The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 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 size-300 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration carries a 1/4 in NPT port, a 5 um filter element (the finer of the two catalogue grades), a manual drain for emptying the bowl, a standard regulator with a 0.05-0.9 MPa (7-130 psi) adjustment range, and an embedded square gauge reading in bar. The polycarbonate bowl lets you see accumulated condensate, and a mounting bracket is included.
This is a genuine AirTAC part from the GFR300 series, one of four sizes (200/300/400/600) spanning port sizes from 1/8 in to 1 in, with manual, automatic or differential-pressure drains, 40 um or 5 um elements, and MPa, psi or bar gauge scales available. Flow is published as curves rather than a single rating, so ask us and we will confirm the datasheet figures for your application.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 5 um Manual Drain |
|---|---|
| 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 — square, bar 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. |
| 3 | Gauge scale: bar. 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) |
Filtered, regulated air feeding the tool-change cylinders and pneumatic clamps on a machining centre, where the 5 um element protects close-tolerance valves from water and fine particles.
A conditioning point ahead of the sealing and carton-closing cylinders on a packaging line, giving operators a bar-scale gauge and a set pressure that holds steady through each shift.
A clean-air branch feeding positioners and small control actuators on a process skid, where the manual drain is emptied during scheduled rounds and the bracket fixes the unit to the panel frame.
Size the GFR300 by the flow your line needs: the 300 frame with its 1/4 in port is the mid step in the range, and moving up to 400 or down to 200 changes both port and flow capacity. Choose the drain to suit access: manual (this unit) means an operator drains the bowl, automatic handles it unattended, and differential-pressure drains on a pressure drop. The 5 um element here suits air that feeds sensitive valves or instruments; the 40 um grade is the standard choice for general circuits. Gauge scale (MPa, psi or bar) and thread (PT standard, G or NPT to order) are selected at ordering, and a bracket is included.
Because flow is published as curves rather than a single rated figure, send us your application details and we will confirm sizing against the datasheet before you order.
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 as curves, not as a single rated number, so we do not quote a figure that could mislead your sizing. Send us your application details and we will confirm the datasheet flow figures for this exact 1/4 in NPT configuration before you order.
The M in the code GFR30008MF3WT specifies a manual drain: an operator opens it to empty collected condensate from the bowl, which suits stations visited on a regular maintenance round. The same size is also catalogued with an automatic drain (code A) or a differential-pressure drain (blank), so you can switch types at ordering if unattended drainage is preferred.
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.