Grundfos Watermill Amazon STP-4.0B Brass Positive

Undoubtedly the 'Rolls Royce' of Grundfos shower pumps. With brass impellers and machined brass stampings these pumps can genuinely be described as 'Heavy Duty', offering high performance and durability. All models are fitted with long-life carbon graphite and high density ceramic seals and supplied with stainless steel flexible hoses. For domestic, commercial or light Industrial applications – suitable for use with 22mm pipework.