The S Trap has an inlet dimension of 1 1/2 In. and includes a 1 1/2 In. X 1 1/4 In. adapter washer for 1 1/4 In. pipe. The trap can be used in both kitchens and bathrooms and includes all necessary nuts and washers. The length of the S Trap is 20 1/2 In. and drains into the floor. White Poly Plastic