The AirTAC AirTAC GFR300-15 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 GFR300-15 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This 300-size unit is fitted with a 1/2 in NPT port, a 5 um filter element (code W) for finer filtration than the 40 um standard, and a manual drain that you open by hand to expel collected condensate. It is the low-pressure (L) type, intended for circuits that run at reduced working pressure, and no gauge is fitted (code N). A mounting bracket is included.
This is a genuine AirTAC part. The GFR family is published in sizes 200, 300, 400 and 600, with a choice of 40 um or 5 um filtration, differential-pressure, automatic or manual drains, gauge options, and PT (standard), G or NPT threads. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing). Flow is published as curves rather than a single rating, so ask us to confirm flow and datasheet figures for your application before ordering.
| Model | AirTAC GFR300-15 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 | Low-pressure 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. The low-pressure type adjusts over a lower band than standard; we confirm the exact figures from the factory datasheet. 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)). |
| L | Low-pressure 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. |
| (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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
A 5 um element keeps clamp cylinders free of water and swarf-laden air, while the low-pressure regulator holds a reduced set pressure for delicate workholding. The manual drain is opened at shift end to clear the bowl.
Clean, filtered air at a controlled low pressure is fed to air knives or nozzles that clear dust and crumbs from cartons without damaging lightweight product. The manual drain suits a line that is shut down and serviced daily.
In a paint or coating cell, the 5 um element helps keep water and particles out of the air line feeding spray equipment, and the low-pressure type regulates the reduced working pressure the process calls for.
Size and port: step up through 200, 300, 400 and 600 as your required flow and pipe size grow; this unit is size 300 with a 1/2 in NPT port. Drain: choose manual (as here) if an operator can drain the bowl periodically, or automatic / differential-pressure if you want condensate handled without intervention. Filter grade: 40 um is the standard element; 5 um (W) suits finer downstream equipment such as this unit carries. Gauge: units can be ordered with a gauge (square or round, MPa / psi / bar scale) or without, as here. Thread: PT is the standard; G (BSPP) and NPT are order options. A bracket is included on this configuration.
Because flow is published as curves rather than 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. Without the K option, air cannot flow back through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for this family as curves rather than a single rated figure, so we do not quote a number. Tell us your application and we will confirm the flow and full datasheet figures on request before you order.
The M in the code specifies a manual drain: condensate collected in the bowl is released by opening the drain by hand, which suits lines that are checked or shut down regularly. The same family can be ordered with an automatic drain or the default differential-pressure drain if you prefer not to drain it manually.
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.