Abstract: An improved toilet bowl construction for providing access to a siphon or trap therein comprises a toilet bowl which defines an opening positioned in communication with the siphon. The toilet bowl construction further includes an annular cover member coupled to a resilient sealing member. The cover member includes a lever pivotally coupled thereto and movable by a user between a first position and a second position displaced from the first position. The lever bears against the resilient sealing member when placed in the second position. The pressure against the sealing member decreases the diameter of the sealing member such that the sealing member can be inserted into the access opening. Returning the lever to the first or non-bearing position allows the diameter of the sealing member to increase and seal tightly within the access opening. Removal of the sealing member is accomplished by again placing the lever in the second or bearing position and withdrawing the sealing member from the opening.