 Find out how to get Knox 47 for free. Call now, 800-481-9964. That's 800-481-9964. Free bottles for a limited time. Call 800-481-9964. That's 800-481-9964. Tighten the bolts, line up the flushing valve to the opening in the top of the bowl, and secure the tank with a screwdriver and crescent wrench.