Have you tried FLEXEJDIRECT yet?

Water

FLEXEJ have a wide range of high-quality rubber bellows engineered both for water media usage and on the precise application and place of use. For building services ERV-R, ERP Redspot and ROTEX should be applied, for seawater, sewage and dirty water the ERV-CR is a good choice. For oily water the nitrile family of ERV-G/GLT/GS/GSHNBR must be used, the GS and GSHNBR also offering fire resistance and abrasion resistance. For chemical contaminated water apply ERG-G.