The AirTAC GFR300-08 AirTAC Filter Regulator 1/4 in NPT, 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 GFR300-08 is an AirTAC GFR300 filter regulator: a single body that removes water and particulate from compressed air and regulates downstream pressure. This unit is the size 300 body with a 1/4 in NPT port, 40 um standard filtration, and a manual drain, so an operator or maintenance routine opens the drain at the bottom of the polycarbonate bowl to expel collected condensate. A reverse (check) valve is fitted, and the standard regulator covers an adjustment range of 0.05-0.9 MPa (7-130 psi). No gauge is fitted on this configuration, so a separate gauge is needed to read the regulated pressure.
This is a genuine AirTAC part. The GFR family is offered in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, and options including automatic or differential-pressure drains, a 5 um filter element (code W), gauge choices and G or NPT threads. Flow for this series is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator 1/4 in NPT, 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 | Not fitted |
| 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. |
| J | Supplied without bracket. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 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) |
Mounted at the inlet of a machine's air preparation manifold, the GFR300-08 cleans the supply of water and debris and holds a stable regulated pressure to the panel's directional valves, with the check valve holding the downstream setting if upstream pressure dips.
On a packaging or cartoning line running 1/4 in plumbed drop lines, this unit feeds the cylinder circuits with filtered, regulated air, and the manual drain is emptied during scheduled changeover and cleaning stops.
At an individual bench or cell on a factory air ring main, the filter regulator gives the operator clean air at a set pressure for air tools and small actuators, with the 40 um element catching pipe-scale and the manual drain cleared at shift checks.
Size 300 with a 1/4 in NPT port suits lines plumbed in 1/4 in pipework; step up to size 400 or 600 where the circuit demands more flow, or down to size 200 for compact drops. The manual drain on this unit means condensate is released by hand, which suits installations that are visited regularly; choose the automatic or differential-pressure drain versions where the unit is inaccessible or unattended. The 40 um element is the standard grade for general air preparation; specify the 5 um W option where finer particulate removal is required. This configuration carries no gauge and no bracket, so plan for a separately mounted pressure gauge and fix the body by its port connections. PT is the standard thread; G (BSPP) and NPT are catalogue options to order. 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. The reflux valve permits reverse flow 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 rated flow, Cv or SCFM number. Tell us your application and line pressure and we will confirm the sizing from the datasheet on request before you order.
The M in the code GFR30008MJNTK specifies a manual drain: condensate collected in the polycarbonate bowl is released by hand, which suits positions checked during routine maintenance. The N specifies that no gauge is fitted, so add a separate pressure gauge to read the regulated output; gauge options are available in the GFR range if you prefer a factory-fitted one.
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.