If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You will be required to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below.
Re: What is the lead cylinder on old bathtub drain line?
It's called a drum trap. It serves the purpose of any other fixture trap - the water seals the trap so methane gas cannot pass through the drain and to catch heavy objects that shouldn't pass into the DWV system.