Ultra-Inline Spill Deck® - Inline Model Using 2-drum Ultra-Spill Decks and connecting them with bulkhead fittings and bladder attachments, we can provide spill containment that “hugs the walls” and stays out of the way. Using 2-drum Ultra-Spill Decks and connecting them with bulkhead fittings and bladder attachments, we can provide spill containment that “hugs the walls” and stays out of the way.