How To Measure
Please read carefully and follow these simple measuring guidelines:
* Important Notes *
The easiest way to find out if you have a standard toilet supply hose is to take a 5/8" open end wrench and place it on the hose nut that attaches your toilet's supply hose to the toilet supply valve. If it fits, then you have a standard 3/8" compression-type valve and hose. "Yes, it fits! Take me back to the Order Page." If you do not have a 5/8" open end wrench proceed to Step One.
Step one
There are three types of "Toilet Supply Line" fittings that connect up to the "Toilet Supply Shut-Off Valve", 1. 3/8" Compression (most common) 2. 1/2" Compression (not very common) 3. 1/2" NPT (rare). To determine which one you need, take out a ruler, a piece of scrap paper and a pair of scissors. Cut a strip of paper approximately 3/8" wide. Now, cut off a piece of the strip EXACTLY - 2 & 1/4" long. At this point it will look something like "a fortune out of a fortune cookie" that would say, "Your life is about to change for the better!" Ok, next, go to your "Toliet Supply Shut-Off Valve". Where the "Toilet Supply Line" from the water tank meets the shut off valve there is a nut, wrap the strip of paper around this nut (see the pictures below). If the strip meets end to end or overlaps a little then, bingo,you're done! You need a 3/8" Compression adapter. If the strip is too short and there is a large gap (approximately 3/8" long gap) then bango, please go on to step two. "No, I'm done! Take me back to theOrder Page."
Step Two
To determine if you need the 1/2" Compression or 1/2" NPT adapter, once again take out a ruler, this time cut a strip of paper EXACTLY - 2 & 1/2" long. Once again wrap the strip of paper around the nut. If the strip meets end to end then, bingo, you need a 1/2" Compression adapter. If the strip is too short and there is a large gap (approximately 1/4" to 1/2" long gap) then you need the 1/2" NPT adapter. If you still need help please call or e-mail bongo.

If the paper strip meets, BINGO, you have a standard 3/8 toilet supply fitting.
