Abstract
A wrench assembly to assist in opening and/or closing a containment vessel in a water treatment system. The wrench assembly includes a primary handle configured to rotationally interlock with the main body of the containment vessel and a secondary handle coupled to the primary handle and configured to rotationally interlock with the closure of the containment vessel. The main body includes one or more engagement features configured to interfit with the primary handle. Similarly, the closure includes one or more engagement features configured to interfit with the secondary handle. The primary handle may include a guide portion defining an elongated slot that is configured to receive and guide movement of the secondary handle relative to the primary handle. The secondary handle may snap-fit into place within the slot. The primary handle may be configured to seat against a portion of the main body when properly positioned on the main body.