My old Mopar Battery did not have one. I inspected under the battery after it was removed. All was clean no rust or corrosion visible. I every few months put baking soda in a measuring cup and flush the base out. I have a Mercury Milan that uses very similar battery and it does not have a vent drain catch pot either. I just put a new Bosch battery in it last week. It had no venting of any kind. It looks like these would be available at Auto parts stores or internet, but the only thing I find tells me they exist, but no part # or kits, etc.