Are you trying to install an electronic bidet toilet seat on a skirted toilet but can't access the fill valve under the tank? Do you have a 3/8" shut-off valve at the wall and wish you could add a t-valve there instead of at the toilet's fill valve?  We have a solution for you. This t-valve has top male and bottom female connections that are 3/8" compressions threads.  Install this t-valve between your current toilet supply hose and the shut-off at the wall.  The third outlet is a 1/2' pipe thread so you can connect the bidet seat of your dreams to your skirted toilet. Not compatible with TOTO Washlets alone Must add THP3141 Washlet hose adapter  OR use the extension hose for skirted toilets instead Not compatible with Non-Electric Bidets due to hose incompatibility For non-electric bidets like the Alpha ONE V2 or GoBidet 2003c that use 3/8" compression threading, use the 3/8" compression brass t-valve instead. If you have a 1/2" shut-off valve, you will need the 1/2" t-valve instead: