Red Sea ATO Siphon Breaker

The Red Sea ATO Siphon Breaker is a simple yet essential safety accessory designed to prevent back-siphoning in automatic top-off (ATO) systems. By allowing air to enter the tubing when the pump stops, it breaks the siphon effect and stops unwanted water flow from returning to the reservoir.

Compatible with Red Sea REEFER and MAX systems, as well as other ATO setups using standard tubing, this siphon breaker helps protect against accidental overflow, equipment damage, or unstable salinity levels caused by backflow.

Made from durable, marine-safe materials, the Red Sea ATO Siphon Breaker ensures reliable long-term operation even in saltwater environments. Its compact and easy-to-install design fits neatly into your ATO line and requires no maintenance once fitted.

This small yet critical component helps maintain a stable and consistent water level, ensuring the accuracy and safety of your automatic top-off system — ideal for reef tanks, marine aquariums, and sumps.

Key Features:

• Genuine Red Sea replacement and upgrade accessory

• Prevents back-siphoning and overflow in ATO systems

• Allows air intake to break siphon when pump stops

• Compatible with Red Sea REEFER & MAX systems

• Fits most standard ATO tubing

• Made from marine-grade, corrosion-resistant materials

• Compact and easy to install – no maintenance required

Protect your aquarium from backflow and maintain stable water levels with the Red Sea ATO Siphon Breaker — a simple, effective solution for reliable ATO performance.

Red Sea Part Number R35627