排はい水すい芯しんMeanings1nountoilet drain outletTechnical term for the outlet of a toilet drain, used in plumbing and construction contexts.排はい水すい芯しんの位い置ちを確かく認にんしてから便べん器きを設せっ置ちしてください。Please check the position of the toilet drain outlet before installing the toilet bowl.