opening drum trap

Step-by-Step

Many older bathrooms have a removable metal cap on the floor, usually near the tub. This covers a drum trap. Before opening it, bail out the tub, and remove standing water with rags or a large sponge.

auger

Removing the cap may be difficult. If a wrench does not do the trick, use a hammer and cold chisel or screwdriver. Damage the trap cap if necessary (it can be replaced easily), but don't hurt the threads on the trap. Open the trap slowly, watching for water to well up around the threads. If the trap is full, work the auger away from the tub toward the main drain. If the trap is only partially full (as shown), the obstruction is between the tub and the trap, so auger back and forth.