Unique discreet cassette allowing the vent to sit unobtrusively in the roof yet keeping water above the roofline at all times. Features Factory fitted round felt sleeve which significantly reduces the felt tearing that can occur around rectangular spigots. RV10K Large spigot for roof ventilation. Extraction Pipe terminal that can provide a 110mm connection supplied with seperate NSA110 adaptor allowing simple installation without the need to cut tile battens. Ventilation Area 10000mm2. Water Resistance Exceeds all relevant parts of DoE partners in technology programme. Roof Pitches Over 20 Degrees. Note Colour Match Available - Please contact the Sales Office on 01752 692760.