The AirTAC GFR300C10MLJNWT AirTAC Filter Regulator NPT3/8, 5 um 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 See datasheet 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 GFR300C10MLJNWT is an AirTAC GFR-series filter regulator: it removes water and particulate from compressed air and holds the downstream pressure at a set point, in one body. This size 300 unit is threaded NPT3/8 (3/8 in), carries the 5 um filter element (code W), drains manually (code M) and is the low-pressure (L) regulator type. It is supplied without a gauge, without a mounting bracket and without a reverse/check valve. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. The bowl on the 300 frame is polycarbonate (PC).
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and can be ordered with automatic, manual or differential-pressure drains, a 40 um or 5 um element, a gauge (square or round, with MPa, psi or bar scales), G (BSPP) or NPT threads, and a bracket. Flow is published as curves rather than a single rating, so ask us to confirm sizing and datasheet figures for your application before ordering.
| Model | GFR300C10MLJNWT AirTAC Filter Regulator NPT3/8, 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | See datasheet (PT 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 — factory standard, Factory standard 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. |
|---|---|
| C1 | Port size See datasheet. 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). |
| (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. |
| (blank) | PT 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 · See datasheet · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-C1 (two-unit set) |
On a CNC fixture line, this filter regulator cleans the shop air and holds a steady low set pressure to the clamp cylinders so parts stay gripped consistently through the cycle.
On a water-treatment skid, quarter-turn pneumatic actuators often run below standard line pressure; the low-pressure L type lets the operator set and hold that lower control pressure, with the 5 um element protecting the actuator's internal seals.
On a carton-packing conveyor, diverters and pushers run off a shared air drop; a filter regulator at the drop removes water and chips and keeps cylinder pressure stable shift after shift.
Pick the size and port against the flow your line needs: size 300 with a 3/8 in port sits in the middle of the GFR range (200/300/400/600, 1/8 to 1 in). Drain is a real choice - manual (this code) means opening the drain to release collected condensate, while automatic and differential-pressure drain codes handle it for you. Filter grade is 40 um standard or 5 um (W) for finer protection; this unit carries the 5 um element. The low-pressure (L) regulator type is intended for circuits set below the standard range - the exact range is not published, so confirm it with us. Thread here is NPT; PT is the standard thread and G (BSPP) is also an order option. Bracket and gauge are order options too; this code includes neither. Because flow is published as curves, not 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. Without the K option, air cannot flow back through the unit. A filter regulator adds no oil to the line.
AirTAC publishes GFR flow as curves rather than a single rated figure, so we do not quote a number. Send us your line pressure, set pressure and expected air demand and we will confirm sizing from the datasheet on request.
The M code in this model specifies a manual drain: condensate collects in the polycarbonate bowl and is released by opening the drain during routine checks. Choose manual where the unit is accessible and inspected regularly; choose an automatic or differential-pressure drain code where the unit is hard to reach or the line runs continuously.
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.