RV Freshwater Tanks & Inlets

Choose a tank size based on the number of occupants, typical trip length, and water usage habits; common RV freshwater tank sizes range from about 10 to 100+ gallons, and you should balance available space and weight capacity against desired autonomy

Freshwater tanks are commonly made from polyethylene (plastic), stainless steel, or aluminum; polyethylene is lightweight, corrosion-resistant, and cost-effective, while stainless steel and aluminum offer greater durability but typically higher cost and weight

Look for a standardized inlet size and type (city water vs. gravity fill), a secure, leak-resistant cap, compatibility with common hoses, and durable mounting; optional features include built-in filters, backflow prevention, and clear labeling for potable water

Follow manufacturer instructions, drain and disconnect existing plumbing, support the tank to avoid stress on fittings, use proper sealants or gaskets on fittings, and pressure-test the system for leaks before restoring normal use; consider professional installation if access or plumbing is complex

Sanitize tanks periodically with a diluted bleach solution or manufacturer-recommended sanitizer, flush the system thoroughly after treatment, inspect fittings and hoses for leaks or wear, and winterize by draining or using antifreeze if temperatures will drop below freezing

Prices vary by material, capacity, and features; budget plastic tanks and basic inlets are available at lower price points, while larger-capacity tanks and metal or specialty fittings increase cost; shoppers in this category can expect a broad range with an average around $100

Use components rated for potable water, avoid lead-containing fittings, follow local and campground rules for water supply connection, and maintain regular sanitation to prevent bacterial growth and protect water quality