Black Round Gutter & Downpipe Fittings Menu Options Half round fittings manufactured by Freeflow. Colour: Black. Profile: Half Round. Suitable for: Round 112mm gutter and 68mm downpipes. Compatible with most major manufactures please see picture chart. Manufactured with UV resistant materials and covered by a BSI Kitemark - no. KM501316. Available in other colours and profiles. For other rain water guttering systems please visit our shop.