[header] How to replace a sink basket strainer [title] Remove the pipe beneath the sink. [step] Unscrew the t-junction or pipe segment closest to the sink and set it aside. Leave the water trap (u-bend) in place to keep sewer gases at bay. 
[title] Unscrew the nut at the base of the basket strainer. [step] Approach the basket strainer from below and unscrew the lowest nut.