 Call 866-822-7328 or visit LettersEasyBreathe.com. Easy Breathe, the happy, healthy home people. Well, I've been talking about Zoller pumps for years now, being the gold standard in sump pumps and battery backup systems. The sump pump is the heart of your groundwater protection system, and Zoller's the only name I'd trust to keep my basement dry. The Zoller Model 63 Primary Sump Pump.