Put the slide up to a full size Bic and take a picture. But maybe the bottoms of both, not side by side. I can tell the mm by comparing to a common object. I have both 14 and 18 mm.
id say 14 but man cleaning is easy, get some high percentage rubbing alcohol and some salt. theres a ton of posts on it here just use the search function.
Nice! Yeah like everyone said, it needs to be cleaned with a high percentage rubbing alcohol like 90% isopryl and epson salt. You can find both in any grocery or supercenter store like walmart.
GOOD DAMN! That is one heavily used bowl. Seriously, I have that same exact bowl, I probaly even got it from the same place (off eBay xD. It's supposed to completely clear. I swear by 420 cleaner, but Iso salt and alcohol works well (so I heard). Just shake it up and it cleans it's self. But you may need a scrub brush or something, that is seriously dirty.
personally I would never use 420 cleaner. It doesn't work as well as iso and salt and it makes whatever your cleaning smell like the scent of the 420 cleaner. Which is awful... Sent from my SAMSUNG-SM-G900A using Grasscity Forum mobile app
I've never used ISO, but I heard it works great. I use 420 cleaner because it was cheap ($4.20 at the LHS) and simple enough (shake for 1 minute, rinse). It worked great on all my pieces. It never left a smell or taste for me, perhaps you didn't rinse it well enough? (The smell while cleaning is quite bad though)
Give it a nice clean man, looks like he had his use with it hahah. 99% iso and kosher salt. RedEyeTek
Put that bowl in a bag or bowl and let it soak for some time then scrub the shit out of it. I would see if you could get the right size rubber stopper for the the bong then fill it up with ISO and let it soak away. Put a bag over the mouth piece with a rubber band to prevent the ISO from evaporating. Lol this is why I clean after ever use. Sent from my iPhone using Tapatalk