Amazon brass pumps are the Rolls Royce of the Grundfos shower pump range, offering optimum performance and durability. The Amazon 4.0 bar brass universal twin impeller shower pump is a continuously rated regenerative pump for domestic, commercial or light industrial applications able to transform any compatible shower system into a true power shower. WRAS compliant Heavy duty brass body and impellers with machined brass stampings Long-life silicon carbide seals Anti-vibration feet Minimum static head 1m Supplied with stainless steel braided hoses Grundfos Amazon STN-4.0B Brass Universal 4.0 Bar Twin Impeller Shower Pump