Silicone hose 11,5 x 3mm. (per meter)
inside dimension: 11.5mm
material thickness: 3mm
outside diameter: 11.5+(2*3)= 17.5mm
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.