Children's Trough Sink . Show more £ (exc vat). Franke washino sanw205p 2100mm children's composite double wash trough with tap deck p/n: SitOn Trough Sinks For Schools & Colleges Solid Surface from www.school-toilets.co.uk Painted models are illustrated by hand protects from wear and tear. The idea for the shape of these sinks came from watering troughs in farms, hence the name trough. Franke washino sanw215p 1600mm children's composite wash trough with tap deck p/n: