soil pipe 
noun
A sewage or waste-water pipe.The only bit that is not quite finished is the seal for the soil pipe but luckily we can still use the toilet till we get one that fits - yet another trip to the plumbers merchant for the right bit....
- He said the last two car fires burned a soil pipe at the side of a house and residents had been unable to use the toilet.
- There is obvious evidence of damp penetration adjacent to the rear external wall including the junction of the cast iron soil pipe.
- colonialist
- coloniality
- colonially
- colonial oven
- colonic
- colonic irrigation
- colonise
- colonist
- colonization
- colonize
- colonizer
- colonnade
- colonnaded
- colonoscope
- colonoscopic
- colonoscopically
- colonoscopy
- colon therapy
- colony
- colony collapse disorder
- colony-stimulating factor
- colophon
- colophony
- color
- colorability