Silicone hose 23,5 x 4mm. (per 50cm)
inside dimension: 23.5mm
material thickness: 4mm
outside diameter: 23.5+(2*4)= 31.5mm
The big advantage compared to the other hoses is that these silicone hoses remain flexible even after years and have a sound dampening effect, the resonance that pumps can produce are absorbed by the hose.