There are internal thread (female adapter) and external thread (male adapter) available, and they both feature 16 mm threads and 1.5 mm pitch.
Car Spray Gun Cup Adapter, 16mm Thread 1.5mm Pitch, MPS Female Adapter PRO-33, P
Spray Gun Cup Pot for ANEST Iwata 600ml Tank General Upper Cup Car Paint Pot
Disposable Spray Gun Cup Liners Lid System 50 Pack 800ml Paint Gun Inner Cup
PPS Spray Gun Cup Adapter Stainless Steel Male to Female Paint Spray Cup System
Q-Cup Spray Gun Cup Adapter SMR-QC40 - Fits Anest Iwata LPH400 Spray Guns
Q-Cup Spray Gun Cup Adapter SMR-QC10 - Fits Full Size SATA Gravity Spray Guns
