A plastic pin can hold two plastic plates together and can not leak
I don't know how you install it. Is it another board attached to the sink? The utility model can be punched and punched on a water tank, bolt fixed, twisted with raw material tape, and the plate joint part is sealed with a O ring or a rubber cushion.
I see what you mean. It is very difficult to fix a plastic pin without leaking water. You can fix it with stainless steel bolt. You can seal it with a O ring or a rubber pad at the joint where it may leak. Besides, plastics can be welded. How convenient it is to weld them directly.
Also, if you use a better PVC electrode, there is still a certain possibility of welding. General PVC plastic welding rod 7~9 block one kilogram, you need to buy 40~50 block of transparent plastic welding rod. I recently welded a thing that is different materials plastic, with good electrode, will deal with it.
Plastic welding can only be welded with the same material of plastic, different materials can not be welded; with a circular gasket bar, like the sink under the sink, you go to the building materials market should look for.
