The Arsenal One QC # Quick Change Multi-Product Dispenser is a compact dual product dispenser that safely and automatically dilutes Arsenal One brand 2.5 liter chemical concentrates with water to create cost-effective, ready-to-use cleaning/disinfecting formulas. The dispenser is used to fill spray bottles, buckets and autoscubbers. Side A is the dedicated product slot used for disinfectants and sanitizers. Side B is the quick change slot. Simply slide a refill into the slot and an innovative docking station automatically engages the bottle insert. You will hear a #click# as the dock engages. Simply pull the refill out and the docking station disengages and releases the refill bottle.