The AirTAC AirTAC GFR300-10 Filter Regulator 3/8 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 PT3/8" 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 GFR300-10 is a compact filter regulator that removes water and particulate from compressed air and holds downstream pressure at your setpoint in a single body. This configuration is the 300 size with a 3/8 in NPT port, manual drain, standard 40 um filtration and a standard regulator with a 0.05-0.9 MPa (7-130 psi) adjustment range. The manual drain means an operator opens the drain at the bottom of the PC bowl to expel collected condensate, which suits installations that are checked as part of a routine walk-round. No gauge is fitted with this code, so pair it with your own gauge or order a gauge variant if a visual setpoint readout is needed.
This is a genuine AirTAC part. The GFR series spans sizes 200, 300, 400 and 600, with port options from 1/8 in to 1 in, PT as the standard thread and G (BSPP) or NPT as order options, a choice of differential-pressure, automatic or manual drain, 40 um standard or 5 um (W) filtration, and gauge or no-gauge variants. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application before ordering.
| Model | AirTAC GFR300-10 Filter Regulator 3/8 in NPT, Manual Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (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 | 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. |
|---|---|
| 10 | Port size PT3/8". 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. |
| (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 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Feeding a pneumatically actuated press or clamping fixture where clean, dry air at a steady regulated pressure keeps cycle repeatability consistent. The 3/8 in NPT port suits a machine-side drop from the main header, and the manual drain fits a line that is checked each shift.
Supplying regulated air to cylinders, vacuum generators and air nozzles on a packaging or carton-sealing conveyor. The filter stage keeps water and pipe scale out of valve seals, while the regulator holds a stable setting so case-eject and hold-down strokes behave the same all shift.
A point-of-use station at a workbench or tool drop where operators need filtered air at a set pressure for impact tools, air chisels or blow-off. The single filter-regulator body saves panel space, and the manual drain suits a station that is part of the daily housekeeping round.
Start with the port step: this unit is the 300 size with a 3/8 in NPT port, so match it to your existing air line and confirm the size against the flow your application needs - we can check the published flow curves with you rather than quote a single rating. Choose the drain to match your maintenance routine: manual (this code) needs a periodic drain visit, automatic drains on its own, and the differential-pressure default drains when the pressure drop builds. Filtration is 40 um standard; order the W variant if you need 5 um. This code has no gauge and no mounting bracket (J), and the NPT thread is an order option - PT is the catalogue standard, with G (BSPP) also available. Ask us to confirm sizing against the published curves 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 series as curves, not as a single rated figure, so we do not quote a rated l/min, m3/h or SCFM number. Tell us your application and line pressure and we will confirm the flow figures from the datasheet so you can size the unit correctly before ordering.
The M in GFR30010MJNT specifies a manual drain: condensate collects in the PC bowl and is released by opening the drain fitting during a routine check. If the unit will be installed somewhere unattended, the automatic-drain variant (code A) or the differential-pressure default drains without an operator - ask us for those 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.