How to install the double basin sewer pipe in the bathroom?

Hello, it's my pleasure to answer your question: go to the hardware store to buy stainless steel washbasin downspout fittings and a pvc hose with a length of1.2m. Installation: firstly, unscrew the stainless steel nut on washbasin downspout, insert the rubber sealing ring directly into washbasin downspout from the inside out, then put on a sealing ring to tighten the stainless steel nut, loosen the plastic fittings on the upper part of pvc hose, put the rubber around the stainless steel hose and tighten it. Note: the connection between pvc hose fittings and stainless steel parts must overlap by 30-50 mm.