I put in an old faucet and it spraed water out the back. I narrowed it to this and water comes out the hole, so good it is not a crack. IF I blow air in and close off the other inlet then air comes out the hole...
What is the hole for?
The big circle is what the shower hose threads to, and the small threads thread into the faucet.
What is the hole for?
The big circle is what the shower hose threads to, and the small threads thread into the faucet.