Abstract: The new doubling coupler is a generally cylindrical sleeve which connects two standard, spring-action cores for standard, toilet tissue paper roll holders to form a double-length core which can be held between two standard, toilet roll holder mounting brackets, which have been relocated to accommodate the double length core, in order to hold a toiler roll in position for use and also hold a spare roll also in position for use. There is a buffer attached to the sleeve to prevent rotary motion of the roll in use from being coupled directly to the spare roll.