The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4, Round psi Gauge 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 PT1/4" ports, a differential-pressure drain and regulates 0.15 - 0.9 MPa (20 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The AirTAC GFR300-08 is a 300-size filter regulator that removes water and particulate from compressed air and sets downstream pressure in a single body. This configuration is threaded 1/4 in NPT, carries the standard 40 um filter element, and drains condensate automatically by differential pressure, so the bowl empties as the pressure differential across the element builds - no daily manual draining on lightly loaded lines. The standard regulator covers a 0.15-0.9 MPa (20-130 psi) setting range, and the fitted round gauge reads in psi for direct checking of downstream pressure. A mounting bracket is included.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 inch, a choice of differential-pressure, automatic or manual drain, an optional 5 um element (code W), square or round gauges with MPa, psi or bar scales, and G, NPT or PT threads. We confirm flow and datasheet figures on request, since flow is published as curves rather than a single rating.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4, Round psi Gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 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 | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, psi 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 0.15 - 0.9 MPa (20 - 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. |
|---|---|
| 08 | Port size PT1/4". This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| (blank) | Drain: Differential-pressure drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 130 psi)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (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. |
| (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 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeds clean, regulated air to a clamping or press cylinder circuit, with the psi gauge letting the setter verify clamp pressure at the station and the differential-pressure drain keeping the bowl clear between checks.
Conditions the supply to a packaging machine's valve manifold, removing water and wear particles before directional valves and cylinders while holding a stable working pressure through the shift.
Installed at the wall drop feeding an assembly bench, it filters the shop air and lets each operator set and read bench pressure locally in psi without walking back to the main FRL.
Work size and port against the air demand of the circuit: the 300 size here takes a 1/4 in NPT connection, and larger sizes carry larger ports and more flow. Choose the drain to match maintenance reality - differential-pressure (this unit) and automatic drains suit unattended installations, while manual drain suits stations that are checked routinely. Pick the 40 um standard element for general supply air, or the 5 um W option where finer pre-filtration matters. Gauge style and scale (this unit: round, psi), thread family (PT standard, G and NPT as order options) and the bracket are all specified at ordering.
Flow for this family is published as curves, not a single rated figure, so send us your application's air demand and we will confirm sizing against the datasheet 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 this family as curves rather than a single rated figure, so we do not quote one number. Tell us your application's air demand and we will confirm sizing and the datasheet flow figure for the GFR300-08 on request before you order.
The C2 code in GFR30008C2T specifies the optional external round gauge with a psi scale; the embedded square gauge (MPa, psi or bar scales) is the other catalogue choice. The round psi gauge suits US-style circuits where technicians read pressure directly in psi.
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.