Shapotools has now introduced some models of PP / PVDF / PTFE lined Glandless Hydraulic diaphragm pumps with a rugged 4 mm lining thickness for a lifetime performance while handling ultra corrosive chemicals. No Leakages Robust Design Hydraulically Balanced Diaphragm with Rupture Detection Built in Safety Relief Valve High Pumping Pressures & API 675 Accuracies Low NPSHR Continuous Hydraulic oil venting Positive return stroke mechanism