I am tapping into my toilet's water supply line to provide water to a bidet toilet-seat. The 1/2 in. fittings supplied with the bidet would work on the fittings inside my toilet... but I can't reach them. The toilet is installed too close to the wall. But the valve at the wall is accessible. There is a metal braided line connecting the toilet to the valve assembly coming out of the wall. Here's what I'm *trying* to do... though I'm open to a better solution: Diagram I turned off the valve, unscrewed the braided toilet supply line, and measured the fitting with a template... I thought it was a 1/4" line, so I bought tee depicted above, and... the 1/4 in. (female) part of the tee wouldn't screw onto the wall supply valve's fitting. Ugh... The braided hose from the toilet could (almost/barely) fit onto the 1/4 in. (male) part of the tee... but I think I've just got the wrong tee... is the wall supply fitting not NPT? If not... what is it? See pics... might help explain. Disconnected toilet supply line close-up of wall supply valve Comparison of wall supply male ??? fitting and brass tee 1/4 in. male NPT fitting Anyway, can someone provide some advice? Is there an easier/better way to do this?