toilet tank - purpose of water going into the overflow tube

When filling up the water tank, there is water going into the overflow tube (throug a small black tube connected to the floatmaster). What's the purpose of that water flowing?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
John Smith wrote:

To make sure the bowl trap has water in it.
--
Grandpa

What is that dripping from my fingers?
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Site Timeline

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.