Comparison : Item # QA-63-1, QA-63 Adapter, Vacuum, Short Stem 105°
Item # QA-63-2, QA-63 Adapter, Vacuum, Short Stem 105°
Item # QA-63-3, QA-63 Adapter, Vacuum, Short Stem 105°
Item # QA-63-4, QA-63 Adapter, Vacuum, Short Stem 105°