QuickConnect™ Product End Connector with Water Stop – Melnor, Inc.
Amazon.com : Gardena Water Stop 13 mm (1/2") and 15 mm (5/8"): Connector with Water Stop, Power Grip, Great Hose-gripping Power, Simple Replacement (18213-20) : Patio, Lawn & Garden
Amazon.com : GARDENA Metal Alloy Hose Connector with Water Stop : Garden Hose Parts : Patio, Lawn & Garden