classAcustoms RV Black Water Holding Tank used for Human Waste or Gray Water - DO NOT use for fresh/drinking water MADE WITH Medium Density Polyethylene (MDPE) Resin SEAMLESS One piece seamless construction, no seams to burst RESISTANT Stain, Corrosion and Rust Resistant. Tanks are made in a warehouse light scratching, scuffs, dust, and outlet glue may be present on tanks and does not affect performance of tank. MOUNTING & BRACING Tank must be adequately braced and mounted to hold tank weight when full and to prevent movement when in transit. INLET & VENT INSTALLATION classAcustoms Black Water Tanks only come with the outlet the end user will determine where the inlet and vent will need to be placed and install, customer will need to provide all parts.