The AirTAC GFR300-15T AirTAC Filter Regulator 1/2" 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 PT1/2" 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 GFR300-15T is a size-300 filter regulator that removes water and particulate from compressed air and sets downstream pressure in one body. This configuration has a 1/2 in NPT port, a manual drain bowl in polycarbonate, a 40 um standard filter element, a fitted reverse/check valve, and an external round gauge reading in psi. The standard regulator covers an adjustment range of 0.05-0.9 MPa (7-130 psi) with manual drain, and the unit handles a maximum inlet pressure of 1.0 MPa (145 psi) at -5 to 70 C (non-freezing). No mounting bracket is included (code J).
This is a genuine AirTAC part from the GFR filter-regulator family, available in sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, PT as the standard thread and G or NPT as order options. Drain, filter grade, gauge style and scale, low-pressure type and reverse valve are all selectable. Flow is published as curves rather than a single rating, so we confirm datasheet and flow figures for your application on request.
| Model | GFR300-15T AirTAC Filter Regulator 1/2" NPT 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, psi 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. |
|---|---|
| 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. |
| 2 | Gauge scale: psi. 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 · PT1/2" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
Filtering and regulating the shop-air feed to a machining centre's pneumatic tool changers and clamps, with the psi gauge giving operators a visible setpoint at the machine.
Conditioning air ahead of cylinders and diverters on a carton-sealing or wrapping line, where the manual drain suits a shift-based maintenance routine and the check valve holds the setting.
Dropping pressure for looms and winding heads fed from a plant main, removing condensed water and pipe scale at the point of use with the 40 um element.
Start with the port step: this size-300 unit carries 1/2 in, and the G-series steps through 1/8, 1/4, 3/8, 1/2, 3/4 and 1 inch across sizes 200 to 600, so pick the size whose flow curve covers your demand. Choose the drain next: manual drain (this unit) needs periodic bowl draining, while automatic or differential-pressure drain suits unmanned installations. The 40 um element is the standard grade; specify code W for the 5 um element where finer filtration is required. Gauge options are the embedded square gauge or an external round gauge, with MPa, psi or bar scales - this unit has a round psi gauge. Thread is PT as standard; G (BSPP) and NPT (this unit) are order options. A bracket can be ordered where this J-coded unit ships without one.
Because flow is published as curves and not a single rated figure, 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 GFR series as curves rather than a single rated figure, so we do not quote a rated SCFM or l/min number. Tell us your working pressure and air demand and we will confirm the sizing from the datasheet curves on request before you order.
This GFR300-15T is coded M for a manual drain, so accumulated condensate is released by opening the drain by hand - a good fit where the bowl is checked as part of a regular maintenance round. If the unit will sit unattended, the same size-300 filter regulator can be ordered with an automatic drain (code A) or the default differential-pressure drain instead.
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.