Shower drain assemblies

A shower drain assembly, comprising:

• a shower drain comprising:
• an upper opening;
• a lower opening;
• a ledge having an upper surface and being substantially concentric with the upper opening and the lower opening of the shower drain;
• and
• inside threading;
• a retaining ring comprising a plurality of angled teeth, and
• wherein the retaining ring is configured to rest on the upper surface of the ledge of the shower drain;
• and
• a sealing ring assembly, the sealing ring assembly comprising:
• a test membrane;
• outside threading configured to couple to the inside threading of the shower drain;
• a plurality of grooves substantially concentric with the upper opening and the lower opening of the shower drain, each configured to receive an O-ring;
• an inside cylindrical surface;
• an outside cylindrical surface;
• and
• an opening through the sealing ring assembly extending radially from the inside cylindrical surface to the outside cylindrical surface,
• wherein a lower surface of the sealing ring assembly is configured to contact the retaining ring when the sealing ring assembly is threadingly mated to the shower drain.