The hardest part of setting up a new sink and faucet is connecting the faucet s tailpiece to the drain pipes. Start with the drain pipe closest to the sink tailpiece and then work up to the source. That’s where a swivel P-trap with a trap adapter shines, as it can swing from side to side on two axes or adjust up and down. Before you head to the shop, We recommend drawing up a map as needed using the illustration pictured here and checking the inside diameters of the tailpiece and waste line, which are often 1 and a half inches. Then, instead of purchasing a kit, just get the pieces you need, including Schedule 40 PVC pipe, to cut and fit as needed.