The EXCAL tube and teat stop-valve is a one-piece plastic moulding with a stainless steel ball.
The valve stem is 7.7mm o.d., suitable for plastic tube with i.d. from about 6mm to 7mm. Valve length 23mm o.a. Diameter 13mm at maximum.
The stop valve can assist the calf suckling.
Available as 10-pack only.