The #110 T mount adapter flange adapts specific #2 shutter housing types to user equipment fitted with a T mount thread (42mm x 0.75mm pitch). This adapter can be attached to the #2 housing rear surface (via the 1.625in x 40 TPI thread) or the front surface (via three #4-40 flat head screws). The VS14/25 and VS35 series, only, can be configured with this flange type.