I got a bell from them too and no plug. I got these off Amazon and they work perfect for clamping the tube. So much easier than a plug.
Quickun Plastic Tube Tubing Clamps, 3/16"-5/16" Tube OD Shut Off Hose Clamp Water Flow Control Tube Clip Pipe for Beer Bottle and Infusion Bottle for (Pack of 5) https://www.amazon.com/dp/B08BTQMK36/ref=cm_sw_r_cp_api_glt_fabc_0RMDV74D3YPY63HE0E80?_encoding=UTF8&psc=1