Ibn Jurayj says: Muhammad informed me: I asked Yahya bin Aqil: Which jars? He said: The jars of Hajar. Muhammad, the narrator, says: I have seen the jars of Hajar; in my estimation each jar was equal to two waterskins.
The first chain is better preserved, and Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1252