You need to do 2 measurements:
-Interior diameter of the downstem. There are 2 standard sizes of replacement sliders, not including glass-on-glass. You need to know this number.
-Maximum length that your new slider can be without making contact with the side of the bong, etc. This is approximately the length of the downstem, but you shoudl check. Measure by sticking a chopstick into the bong as far as it will go before making contact, then draw it back about an inch and pinch it right where it enters the hole. That's the longest possible slider your bong will safely accept.
stinkyattic Reviewed by stinkyattic on . bong question I have this bong I got from a friend for free. Only deal is, I didn't get a slider with it. So I rigged up some paper and a chillum and went to town. Recently I've been looking into buying a new slider but notice all the measurements and such on the ads. What do I need to measure on my bong or how do I tell what size of a slider I need? Rating: 5