A drainage system according to certain aspects of the present disclosure may include a container having an interior and a mouth, where the mouth has an outer surface and an opening. The drainage system may further include a frangible seal covering the opening and a cap, where the cap is secured to the mouth and is in fluid communication with a drainage line, and where the cap has an inner surface configured to engage with the outer surface of the mouth. An O-ring may be located at least partially between the outer surface of the mouth and the inner surface of the cap to form a fluid seal between a space defined by the cap and the space located externally of the drainage system.