The AirTAC GFR300-15NPT AirTAC Filter Regulator, 1/2 in NPT, 5 um is a genuine G-series filter regulator: water separation, 5 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 GFR300-15NPT is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This size 300 unit is fitted with 1/2 in NPT ports, a fine 5 um filter element (code W), a manual drain bowl in polycarbonate, and a built-in reverse/check valve that holds downstream pressure when the upstream supply is lost. The standard regulator covers 0.05-0.9 MPa (7-130 psi) and no gauge is fitted, so a gauge can be added as an order option if you want a visual setpoint. A mounting bracket is included.
This is a genuine AirTAC part from the GFR range, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, thread options PT (standard), G and NPT, drain choices and filter grades. Flow 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 | GFR300-15NPT AirTAC Filter Regulator, 1/2 in NPT, 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (NPT thread) |
| Filtering grade | 5 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. |
|---|---|
| 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. |
| (blank) | Mounting bracket included. |
| 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. |
| W | Filtering grade 5 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
Feeds filtered, regulated air to the tool-clamp and pallet-change circuits of a machining centre, with the 5 um element protecting the directional valves and the check valve holding the clamp circuit if shop air drops.
Serves as the point-of-use filter regulator on a cartoning or case-packing conveyor, giving the pneumatic cylinders clean air at a set pressure while the manual drain is bled during scheduled line cleaning.
Installed at branch take-offs from a factory air ring main to condition supply for individual work cells, combining water and particle removal with local pressure setting in one 1/2 in NPT connection.
Size 300 with 1/2 in NPT ports suits lines whose required flow sits in the mid range of the GFR family; step up to size 400 or 600, or down to 200, according to the flow curve for your consumption. The 5 um element (W code) is the finer choice over the 40 um standard - pick it where downstream valves, cylinders or instruments need cleaner air. Manual drain means an operator opens the bowl drain at intervals; choose automatic or differential-pressure drain codes if the unit will be hard to reach. The check valve (K) is already fitted on this code. No gauge is fitted; gauge style and scale (MPa, psi or bar) can be ordered. PT is the standard thread and G or NPT are order options - this code is NPT. We confirm flow from the datasheet on request, since it is published as curves, not a single rating - ask us to check 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 as curves, not as a single rated number, so we do not quote a figure here. Tell us your operating pressure and air consumption and we will confirm the flow and sizing from the datasheet on request before you order.
The M in the code selects a manual drain: an operator opens the bowl drain to release collected water, which suits accessible mounting points on a maintenance schedule - automatic or differential-pressure drain codes are available for hard-to-reach spots. The N code means no gauge is fitted; a gauge with MPa, psi or bar scale can be added as an order option.
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.