Zep Liquid Drain Defense Drain Cleaner, 64 oz. is a powerful liquid enzymatic build-up remover designed to clean and eliminate years of accumulation from plumbing systems, effectively opening slow drains. This safe and effective formula works well on all types of pipes and septic systems, ensuring your drains stay clear without causing damage. The 64 oz. bottle provides a convenient size for regular maintenance and heavy-duty cleaning needs, making it an essential product for keeping your plumbing running smoothly. Model Number: ZLDC648