These huilors allow the adjustment of drip but without the visual monitoring of the flow. .
|Old model of drip without visual monitoring of the flow. The output control is carried out by a punch screw .||detail|
| ARCADIA model and VICTOR
simple model by ESSEX ,
PIONEER model of Lunkenheimer with a screw of flow slowed down by a blade to prevent unscrewing by vibration
Leonergan model out of pressed strip iron. .
This mythical model of the Lunkenheimer company remains old in its design because it does not allow precise adjustments.