One. BathroomSinkHow to install the drainpipe?
Typically, installing the drainpipe under the sink is the final step after the sink and drainpipe have been installed and secured. Ensure that the sink and drainpipe are properly installed; open the packaging of the purchased sink drainpipe; the drainpipe has one end specifically designed to connect to the sink drain; unscrew this end; and then screw the unscrewed end onto the sink drainpipe; place the drainpipe over the sink drainpipe and tighten it against the plastic end that was previously screwed onto the drainpipe; perform a water test to check for leaks; if there is any leakage, wrap the connection between the drainpipe and the drain with self-adhesive tape.

Two. Installation techniques for under-sink drain pipes
1、Using U-shaped drainage pipes can effectively prevent the generation of odors and small flying insects. If not used for an extended period, it is necessary to periodically flush the drainage pipes with water to maintain their odor-blocking function.
2、After installing the drain pipe into the hole of the sink basin, one rubber gasket is placed on the upper part of the basin, and the other gasket is placed on the lower part of the basin: ① a copper nut is tightened around the gasket on the bottom of the basin, and then the basin is placed on the countertop, meaning that both the gasket and the nut are positioned between the basin and the countertop. ② The nut is tightened to the bottom of the countertop, meaning that the gasket is positioned between the basin and the countertop, and the nut is positioned at the bottom of the countertop panel.
3. Purchase stainless steel sink drain accessories and one approximately 1.2-meter PVC soft tube from a hardware store.
First, loosen the stainless steel nut at the drain outlet. Place a rubber seal between the nut and the basin drain opening, then insert them from the inside out. Place another rubber seal, and tighten the stainless steel nut. Then, remove the upper plastic fittings on the PVC pipe, insert them into the stainless steel pipe, and place a rubber ring. Tighten. Note: The connection between the PVC pipe fittings and the stainless steel components must overlap by 30-50mm.