Ø90mm Sealing Caps for Round Ceiling/Wall Plenum spigots where a connector is not used. These must be used to block off gaps in the plenum. These caps keep the plenum hygienic and protect against unwanted ingress of dirt/dust while on site. Simply remove when you want to use the connector or leave intact if it is not being used. These come with sealing rings for the trusted AirflexPro secure connection. These caps are a vital part of the plenum and offer advanced protection with the AirflexPro range offering superior attention to detail.