Zomwe zimagwiritsidwa ntchito pa valve ya mpira iyi ndi upvc, yomwe ili ndi kukana kwamphamvu kwa dzimbiri, kukana kwamadzimadzi otsika, komanso mphamvu zambiri.Mapangidwe a ulusi wamkati ndi osavuta kusonkhanitsa ndi kusokoneza.Kusindikiza pamwamba pa mpira ndi mpando kumakhala kutali ndi sing'anga, zomwe sizili zophweka kuchititsa kukokoloka kwa kusindikiza pamwamba pa valve.