I bought a toilet seat bidet that uses hot water from the sink supply plus cold water from the toilet supply to provide warm water to the bidet. The bidet came with an adapter to connect to the sink shut off valve. The adapter is 3/8 inch. It is too small to fit my shut off valve. I looked at the flexible connector that goes from the shut off valve to the sink faucet. The label says that it is
1/2 inch on both sides. (Both sides of the connector fit on the valve.)I sent the bidet maker an email asking them to send me a 1/2 inch adapter. I received an adapter today but it was still too small for my shut off valve. I thought that they had sent me a 7/16 inch adapter so I went to Lowes and bought a 1/2 inch adapter but it did not fit either.
How can the 1/2 inch connectors on the flexible connector fit the shut off valve but the 1/2 adapters not fit? What size of adapter do I need?