The AirTAC GFR300-15MJC3T AirTAC Filter Regulator NPT1/2, 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 PT1/2" 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 GFR300-15MJC3T is a 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is threaded NPT1/2 (1/2 in), uses the standard 40 um filter element, and drains condensate manually via its drain valve, so an operator or maintenance routine opens the drain as part of scheduled checks. The pressure setting is read on the round external gauge fitted here, which is scaled in bar. The polycarbonate bowl suits standard compressed-air service, and the unit is rated for a maximum inlet pressure of 1.0 MPa (145 psi) with an operating temperature of -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR filter-regulator family is available in sizes 200, 300, 400 and 600 with a choice of ports, PT/G/NPT threads, manual, automatic or differential-pressure drains, a 5 um (code W) element option, gauge styles and scales, and a reverse/check valve option. Flow figures for this family are published as curves rather than a single rating, so we confirm the datasheet and sizing on request before you order.
| Model | GFR300-15MJC3T AirTAC Filter Regulator NPT1/2, Manual Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (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 | 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. |
|---|---|
| 15 | Port size PT1/2". 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. |
| (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. |
| (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 · PT1/2" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
On a bench-mounted pneumatic press or clamping station, this filter regulator cleans the shop air of water and pipe scale and holds a steady regulated pressure to the valve and cylinder, with the bar gauge giving the operator a clear setting reference and the manual drain emptied during shift checks.
On a packaging or cartoning line driving pneumatic sealers, lifters and diverters, the GFR300-15MJC3T conditions the 1/2 in branch feeding the machine's air manifold, protecting downstream valves from condensate and keeping actuator speed consistent through a stable set pressure.
At a factory assembly cell served by a main distribution header, this unit is installed at the point of use to filter and regulate the drop feeding air tools, fixtures and blow-off points, with manual drainage built into the daily housekeeping routine.
Start by matching the size and port to the air demand of the circuit: the 300 size with its 1/2 in NPT port sits in the middle of the GFR range (200/300/400/600), and larger sizes carry larger ports for higher flow demand - confirm the exact step against the published flow curves with us before ordering. This unit has a manual drain, which is the right choice where an operator is present on a regular maintenance round; choose the automatic or differential-pressure drain codes instead if the installation is unattended or you want condensate removal tied to pressure changes. The standard element is 40 um; specify the W code if the application needs the finer 5 um grade. The round gauge fitted here reads in bar; square embedded gauges and MPa/psi/bar scales are the other catalogue choices. Thread is NPT on this unit, with PT standard and G also orderable, and note that the J code means no mounting bracket is included - add the bracket code if you want panel or wall fixing. 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. 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 series as curves rather than a single rated figure, so there is no one rated flow number we can quote. Send us your air demand and line conditions and we will confirm the sizing from the datasheet curves on request before you order.
The M code in GFR300-15MJC3T specifies a manual drain: condensate collected in the polycarbonate bowl is released by opening the drain valve during a scheduled check. Choose manual where an operator is regularly present; the automatic (A) and differential-pressure (blank) drain codes suit unattended or duty-cycled installations.
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.