The AirTAC GFR300-10 AirTAC Filter Regulator NPT 3/8 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 PT3/8" 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 GFR300-10 is a filter regulator: it removes water and particulate from compressed air and holds downstream pressure steady in one compact body. This size 300 unit has 3/8 in NPT ports, a 40 um standard filter element and a manual drain bowl in polycarbonate, so condensate is released by hand during routine checks. The regulator is the standard type with a 0.05-0.9 MPa (7-130 psi) adjustment range, and a reverse/check valve is fitted to hold the set pressure if the upstream supply drops. No gauge is fitted with this code, so add one separately if you want to read the outlet setting.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, and choices of thread (PT standard, G or NPT), drain (differential-pressure, automatic or manual), filter grade (40 um standard, 5 um with code W) and gauge. We confirm flow and datasheet figures on request, since flow is published as curves rather than a single rating.
| Model | GFR300-10 AirTAC Filter Regulator NPT 3/8 Manual Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (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 | 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. |
|---|---|
| 10 | Port size PT3/8". 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. |
| (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 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Feeds clean, regulated air to the tool-clamp and chip-blow-off circuits on a CNC machining centre, with the check valve holding the clamp pressure if the shop supply dips.
Conditions the air feeding cylinder-driven carton forming and sealing stations on a packaging conveyor, keeping actuator speed consistent as the compressor cycles.
Supplies filtered, regulated air to a small pneumatic press or stamping fixture, with the manual drain emptied during scheduled shift checks.
Start with the port and size: this unit is size 300 with 3/8 in NPT ports; step up to size 400 or 600 if your line needs more flow capacity, or down to 200 for smaller circuits. For the drain, manual suits installations that are checked regularly; choose automatic or differential-pressure drain if the bowl must empty without operator attention. The 40 um element is the standard grade; specify 5 um (code W) only where finer filtration is genuinely needed. A gauge is not included with this code - order one if the outlet pressure must be read. Thread is NPT here; PT is the AirTAC standard and G is also available, so match your piping. A mounting bracket is included. 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. The reflux valve permits reverse flow 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 required flow, and we will confirm sizing against the datasheet on request before you order.
Code M means the polycarbonate bowl is drained by hand, which suits stations checked on a regular schedule. If the bowl must empty unattended, the same size is available with automatic or differential-pressure drain - just ask for the matching code.
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.