MIFAB's MI-JS rolling style compression joint sealer or-ring is used to conect 4" Clay, Plastic or Steel pipe to 6" Clay, Plastic or Steel pipe in DWV systems. The MI-JS fits 4.20" through to 4.60" O.D. house pipe and fits 5.75" to 6" I.D. sewer pipe. Applicable for above ground gravity (non pressure) flow applications only.