It is narrated from Sayyidah Aishah (may Allah be pleased with her) that she was asked about a man who puts his hand into the vessel while he is junub. She (may Allah be pleased with her) said: "Nothing makes water impure, but he should first wash his hand. The Messenger of Allah (peace and blessings be upon him) and I used to bathe together from a single vessel."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 886