The AirTAC GFR300-08 NPT AirTAC Filter Regulator, 1/4 in, 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 regulates downstream pressure in a single body. This 300-size unit is threaded NPT 1/4 in, carries a 40 um filter element, and drains via a manual drain valve, so an operator opens the drain periodically to discharge collected condensate. A round gauge scaled in bar is fitted for setting the outlet pressure, and a reverse (check) valve is included to hold downstream pressure if the supply drops. The polycarbonate bowl suits this size, and the unit is supplied with a mounting bracket.
This is a genuine AirTAC part from the GFR300 series. The GFR line spans sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, a choice of manual, automatic or differential-pressure drains, a 5 um element option, gauge scale choices, and G, NPT or PT threads. Flow figures are published as curves rather than a single rating, so we confirm the datasheet and sizing on request.
| Model | GFR300-08 NPT AirTAC Filter Regulator, 1/4 in, Manual Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT 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 — round, bar scale |
| Reflux valve | Fitted (reverse flow permitted) |
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. |
| 3 | Gauge scale: bar. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| T | NPT thread. PT is the default; G is BSPP and T is NPT. |
| K | Reverse-flow (reflux) valve fitted. |
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) |
Cleaned and regulated air feeds a small pneumatic press or clamping fixture, with the bar gauge letting the setter dial in the working pressure and the check valve holding the circuit if the main supply dips.
A filter regulator mounted at the machine inlet conditions the air before it reaches cylinders and valves on a cartoning or wrapping line, with the manual drain emptied during scheduled changeover checks.
A bench-mounted unit supplies filtered, regulated air to impact drivers and air ratchets in a maintenance or assembly cell, protecting the tools from water and debris carried in the shop air line.
Start with the port and size: this unit steps up to 1/4 in NPT on the 300 body, and the next step (400 series, 1/2 in) moves to a larger body and higher flow capacity. Choose the drain to match maintenance access: manual drain (this unit) suits stations visited regularly; automatic or differential-pressure drains suit unattended installations. The standard element is 40 um; specify the W option for 5 um where finer particulate removal is needed. Gauge scale (MPa, psi or bar), thread (PT standard, G or NPT to order) and the bracket are all selectable.
Because flow is published as curves rather than a single rated figure, ask us to confirm sizing against your application before ordering - we will supply the datasheet on request.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for this series as performance curves rather than a single rated figure, so we do not quote one number. Tell us your application and we will confirm the flow data from the datasheet and check the sizing for you on request.
The M in the code GFR30008MC3TK specifies a manual drain: condensate collected in the polycarbonate bowl is released by opening the drain valve by hand. Choose this where the unit is checked regularly; automatic or differential-pressure drains are available in the same series for unattended points.
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.