The AirTAC AirTAC GFR300-08 Filter Regulator 1/4 PT, 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 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single 300-size body. This configuration is built with a 1/4 in PT port, a 5 um filter element (the finer of the two published grades), an automatic drain that ejects collected condensate without manual attention, and a low-pressure regulator fitted with an embedded square gauge scaled in psi. The polycarbonate bowl lets you see the condensate level at a glance. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR line spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and options including G (BSPP) or NPT threads, manual or differential-pressure drains, the standard 40 um element, gauge scale choices of MPa, psi or bar, a reverse/check valve, and the low-pressure regulator type. Flow is published as curves rather than a single rated figure, so ask us to confirm sizing and datasheet details for your application.
| Model | AirTAC GFR300-08 Filter Regulator 1/4 PT, 5 um, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (PT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Low-pressure 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 — 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. The low-pressure type adjusts over a lower band than standard; we confirm the exact figures from the factory datasheet. 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)). |
| L | Low-pressure 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. |
| W | Filtering grade 5 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
On a CNC cell where workholding clamps are held at reduced pressure to avoid distorting the part, this filter regulator cleans the shop air to 5 um and holds the reduced setting, with the automatic drain keeping condensate out of the fixture circuit.
Feeding paint-spray guns or air-assisted applicators, the 5 um element and water removal help protect finish quality, while the low-pressure regulator lets the station run below standard line pressure with a psi-scaled gauge at the panel.
On a packaging line where cylinders divert, push and seal product, this unit filters and regulates the branch supply at the drop point; the automatic drain suits lines that run across shifts without an operator visiting each drop.
Step up or down through the GFR sizes (200, 300, 400, 600) and their matching ports (1/8 to 1 in) according to the air demand of the circuit; the 300 size with its 1/4 in PT port suits compact machine supply drops. Choose the drain to match maintenance reality: automatic (this unit) for unattended duty, manual where an operator drains routinely, or the differential-pressure default. Pick the 5 um element (this unit) where downstream equipment needs finer filtration, or the 40 um standard for general supply. Gauge scale can be ordered in MPa, psi or bar, and the thread can be specified as PT (standard), G (BSPP) or NPT when ordering.
One honest routing note: because flow is published as curves and not as a single rated figure, ask us to confirm sizing against your application before ordering. The low-pressure regulator type on this unit is intended for circuits below standard regulation pressure; we will confirm the exact range from the datasheet on request.
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 GFR line as curves rather than a single rated figure, so there is no one rated flow number we can quote for this 300-size, 1/4 in unit. Tell us your application and air demand and we will confirm the sizing against the datasheet curves on request before you order.
This GFR300-08 is built with the low-pressure regulator type, and the exact range for that version is not published on the sheet we transcribe from. The standard-type GFR units regulate 0.15-0.9 MPa (auto or differential-pressure drain) or 0.05-0.9 MPa (manual drain); for this low-pressure unit we will confirm the exact range from the datasheet on request.
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.