8" x 16" PVC Check Valve Extension for 4" Check valves

Hi, Thanks for visiting PlumbersStock.com. When the term FIP is used in conjunction with sink supply lines and other plumbing fittings , it is in reference to the type of connection offered. In this case, the Fluidmaster B4f20 is a Sink supply line that offers a 1/2" FIP connection on both ends. This means that there are 1/2" Female Iron Pipe size fittings that connect to a 1/2" MIP (Male Iron Pipe) threaded fittings or nipples.

Hello, there! Thank you for your question regarding the Fluidmaster B4F20 flex supply line. Yes, you are correct. The end connections of this stainless steel supply line should be of the same size (1/2 inch). We have updated the images to give a clear representation of the product. Should you have further questions or concerns, please do not hesitate to contact us at 435-868-4020 between 8:00 AM and 7:00 PM MST or via E-mail at support@plumbersstock.com. Thank you for visiting PlumbersStock! Have a great day!