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Borosillicate adapter for ground glass joints.
DhOP Drop Down 14mm (M) - 18mm (F)
Drop downs are used to move the heat away from your face when using smaller bongs. They can also be used to protect the ground glass joint on your oil rig. If you over-heat your nail, you're only going to crack the joint on your drop down instead of essentially breaking your bong.
** Glass can contain small imperfections due to the lampworking process