This 1/2″ feed water connector simply connects in between the cold water flexible pipe and the main cold water feed with a T function to direct the flow of the water via a 3/8" Push Fit (Easy Connect) connection to water filter systems, fridge filters, aquarium RO system etc. Super Easy Connection Tee Connection with 1/2" Male and Female BSP Threads + 3/8" (10mm diameter) Push Fit (Easy Connect, EZ Connect, Quick Connect) With certifications from CE, NSF, and its status as a Food Grade Product, our product delivers top-tier quality and safety.