Waste pipe from a refrigerator drain or other receptacle must connect in what manner with the house drain, soil, or waste pipe?

The connection of a waste pipe from a refrigerator drain or other receptacles to the house drain, soil, or waste pipe must be made indirectly to prevent the possibility of contamination and to maintain proper hygiene. An indirect connection usually involves the use of an air gap or a similar device, which helps to prevent backflow and keeps wastewater from contacting potable water sources. This design helps to ensure that any waste or contaminants from the refrigerator do not enter the main drainage system in a way that could cause a health hazard.

Direct connections might allow for back siphonage, thus introducing potential health risks, which is why indirect connections are preferred in plumbing codes. Securely and seamlessly are not applicable terms in this context, as they don't specifically describe the proper plumbing practice regarding health and safety standards for wastewater discharge.