Ø111mm Sealing Cap for Spigots in AirflexPro distribution boxes, this product is required to seal off open/unused ports to maintain airtightness. These caps maintain a hygienic airtight seal which does not affect the airflow rates. Durable and easy to lock in system means they will not be damaged when moving or doing works. The product features markings to indicate where it should be twisted to lock in.