This Whale Adaptor makes it easy to make a proper connection in a plumbing system. It fits 15mm tubing with a versatile ½-In. NPT male fitting. The adaptor was constructed with precision workmanship for the surest fittings, and includes brass for reliable and durable performance. Whale designs and manufactures reliable marine water system products which are easy to install and use; providing boaters with hot and cold water, waste management and durable bilge pumps for peace of mind.