Made of PVC. Adopting a 3mm pitch design, it can prevent the damage of sand, mud and other debris to the screw cap and achieve better sealing, with no leakage ever. Using special rubber and plastic materials to prevent aging, being wear-resistant and leak-proof. The oil squeezing shaft is precision-ground with special steel materials and precisely matched with the cylinder boring. All the oil output pressure components are combined with tapered teeth, getting tighter when pressed, with no leakage at all. With a push-button type exhaust阀 design, it is easy to operate. When sand, stones or other debris mix with the oil and fall into the oil cylinder, the sand discharge screw can be unscrewed to discharge the debris. With a novel design of fine-angle automatic oil absorption.
