*PLUMBERSSTOCK EXPERT* responded:
Hello there! Thank you for trusting PlumbersStock to answer your question about the Canplas 414231BC. It is a Sewer Transition AdapterBushing which has a 6" diameter on one end and a 4" diameter on the other. It is usually installed to a piping system to transition from a PVC Sewer Hub to a DWV Hub. Please check this Specification Sheet for more information. If the specification meets the qualifications that you need, then it might work with you application. Should you have further questions, don't hesitate to ask. PlumbersStock is happy to assist you. Have a great day!