Standard size headgear for the Quattro is part# 16733, the normal "Mirage" series mask headgear. Standard size will fit most heads. Large size is for larger
Mirage ACTiva™ - Headgear Clip (2 pack) - fits all sizes of Mirage ACTiva.
Mirage Quattro - Headgear Clip (2 pack) - fits all sizes of Mirage Quattro
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