Introducing the Excal Tube and Teat Stop-Valve, a premium solution for calf feeding. Crafted with precision, this one-piece plastic molding features a stainless-steel ball for durability. With a valve stem diameter of 7.7mm, it's compatible with plastic tubes ranging from 6mm to 7mm in internal diameter. The valve measures 23mm in length, with a maximum diameter of 13mm. Designed to aid calf suckling, it comes in a convenient 10-pack for your feeding needs