I want to cap off the spray hose unit on my kitchen sink but can't find the cap to do it. Is there one?

I want to cap off the spray hose unit on my kitchen sink but can't find the cap to do it. Is there one?
Follow the spray hose back to the valve body. It will have either a 1/8th or a
1/4" thread. Purchase brass plug in the correct size, wrap the threads in Teflon Tape and remove the hose and install the brass plug. You may now install a soap dispenser or a chrome cock hole cover in place of the spray head. Good luck. Tom

Like Tom says there caps in Home depot of different sizes, click on the link below just for info, Thanks.

John

https://www.hardwareworld.com/F440-38-Brass-Cap-pPFKKYS.aspx

If you have problem finding that correct size nut - than you can also do the following:

Remove spray handle, pull it under the sink, reinstall handle back onto the hose, neatly coil the hose and hang it high on the wall below the faucet under the sink.