Flexible Silicone Tubing. Flexible Silicone Tubing from RS Pro suitable for most Peristaltic pumps. This RS Pro flexible silicone tubing is a high quality, non-toxic, food grade product. Features and Benefits. 3 m length. 1.6 mm tube wall thickness. Withstands sterilisation. Food grade. Wear and abrasion resistant. Product Application Information. Ideal for use with peristaltic pumps.