a tube for a peristaltic pump comprises an elastically deformable tubular body made from a pvc composition containing : 100 phr of a pvc resin having a k value , measured according to standard iso 1628 - 2 , of not less than 85 , from 40 to 100 phr of deha plasticizer , from 0 . 05 to 1 . 0 phr of lubricant , from 0 . 3 to 15 . 0 phr of stabilizer and co - stabilizer . the deformable tube , which is usefully employed for liquid transport in a dialysis apparatus , enables a high level of fluid transport efficiency to be maintained , even after many hours of peristaltic pump operation .