SitaRetention retaining element for SitaStandard and SitaMulti, made of polyamide, to DIN EN 1253-2, for SitaStandard, SitaIndra roof outlets and extension units, adjustable height of the inlet edge of 25 mm – 105 mm, 135 mm – 150 mm or 150 mm – 200 mm and for SitaMulti roof outlets and extension units for emergency drainage for green roofs or retention roofs, adjustable height of the inlet edge of 35 mm – 105 mm, 85 mm – 150 mm or 135 mm – 200 mm, with multi-lip angled sealing ring to seal the retaining element against the roof outlet or extension unit. With three infinitely height-adjustable rubber-metal buffers, installation area per foot: 19.6 cm², with galvanised threaded rod M8 x 90 mm, M8 x 140 mm, M8 x 190, housing with 51 surrounding lugs, in yellow signal colour. Retaining heights are infinitely adjustable, with large inlet pot to increase discharge capacity, supply and install to professional standards.