18.9 litre drum – Part 500502 (XHD) and Part 600502 (EHD) A drum of 18.9 litres, usually to be inserted using a manual pump.The Ultra-Seal product is a preventative tyre sealant liquid. When inserted into a tyre, it repairs most punctures from the inside out. You won’t have to experience a breakdown and you will not even know you had a puncture. The product creates a permanent repair, and keeps working for the life of the tyre.