From fresh water to salt water, Flow-Rite has the marine plumbing system you need. The revolutionary Qwik-Lok™ quick-connect plumbing system replaces leak-prone barb fittings. Designed and engineered to withstand the elements. Qwik-Lok provides increased productivity, quality, and value while reducing costs.The heart of the Qwik-Lok system is the innovative socket that fits industry-standard marine hose in numerous sizes, eliminating any need for additional sealant or crimping.1-1/2" Series: Commonly used for ballast systems and other applications.