Home of The Dauber Stopper™ ~ The easiest and most effective way to protect your A/C's emergency drain line from insects like mud daubers, dirt and other debris. A clogged A/C drain line can lead to severe water damage inside a home. These damages can sometimes cost thousands of dollars to repair, not to mention the stress they cause to the homeowner. The Dauber Stopper is a filter that fits on to existing emergency A/C or water heater drain lines. It guards against debris and keeps insects like mud daubers from entering the line and clogging it with their nests. The Dauber Stopper™ is a great upsell item for service visits by pest control, HVAC and plumbing technicians.