1633 Connecting Vertical Drain Pipes to Horizontal Drain Pipes - Plumbing - Drain Piping -

Image Text: Vertical drain from fixture above > horizontal waste pipe > TY fitting is NOT acceptable > slope: 1/4 inch per foot > vertical drain from fixture above > horizontal waste pipe > a Y fitting is correct for this connection > slope: 1/4 inch per foot > Note: a TY fitting can be used to connect a VENT pipe to horizontal waste pipe