4-Gallon Pressurized RO Storage Tank
Deep-drawn steel construction with polypropylene liner and NSF 58 certified diaphragm for reliable reverse osmosis water storage
The Watts FRO-132-BL is a metal pressure storage tank designed to hold filtered water from residential reverse osmosis systems. The 12" x 16" footprint provides 4-gallon capacity with a 1/4" NPT connection, matching most under-sink RO installations.
Built for Zero Maintenance
Standard RO System Integration
The Watts FRO-132-BL uses a standard 1/4" NPT threaded connection compatible with most residential reverse osmosis systems using quick-connect fittings or compression adapters. The smooth internal liner prevents diaphragm abrasion over time, and the sealed air chamber maintains consistent pressure without requiring adjustment. This is a direct replacement for most 4-gallon under-sink RO storage tanks from Watts, iSpring, APEC, and other manufacturers using standard NPT connections.
