| Code |
Description |
| 131010 / 131020 / 131060 |
Flanged sight glasses, short face to face in cast iron, nodular iron or bronze |
| 132010 / 132030 / 132050 |
Flanged sight glasses; standard glasses in cast iron, cast steel or stainless steel |
| 132011 / 132031 / 132051 |
Flanged sight glasses; borosilicate glasses in cast iron, cast steel or stainless steel |
| 133010 / 133030 / 133050 |
Threaded sight glasses; standard glasses in cast iron, cast steel or stainless steel |
| 133011 / 133031 / 133051 |
Threaded sight glasses; borosilicate glasses in cast iron, cast steel or stainless steel |
| 135080 |
Reflex level gauges in steel |
| 138080 |
Round sight-glass in steel for welding |
