- New
16831 is a straight PEX coupling designed for reliable fresh water plumbing connections. Manufactured by Elkhart (ESCO) under the EcoPoly line, this adapter connects two 3/8 in PEX lines securely. Made from high-grade corrosion-resistant polymer, it provides a tight and durable fit for potable water systems. Ideal for repair, modification, and maintenance tasks, it serves as a practical replacement fitting for compatible RV, trailer, marine, or camping plumbing equipment.