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1. A device for connecting two tubular objects, the device comprising a connection piece housing and a securing element, wherein the connection piece housing has a sleeve portion with a receiving opening, wherein the securing element is shaped in a complementary manner with respect to the receiving opening and is arranged rotatably in the receiving opening, and has an insertion opening for receiving a connection piece, wherein the securing element has securing tabs spaced apart from one another in the circumferential direction, and each have a radially inwardly facing securing body for engaging in shaped features of an inserted connection piece and can be moved from a first radial position into a second radial position lying radially on the outside, wherein the connection piece housing has, for each securing tab, a ramp surface which is beveled radially inwards and on which the respective securing tab rests with a supporting surface, wherein the ramp surface and the supporting surface are shaped such that, by rotation of the securing element about a central axis of the connection piece housing in a first direction, the securing tabs are pushed into the second radial position and, in an unloaded state, the securing element is rotated back into a second direction opposed to the first direction by the securing tabs springing back into the first position, wherein the supporting surface has a lead-in portion and a transition portion, wherein the lead-in portion is beveled radially inwards and the transition portion is beveled radially outwards, wherein the lead-in portion is arranged on a defining edge of the relevant securing tab on the circumferential side and forms a second angle (β) relative to a second radius line (r2) which is located on a plane perpendicular to the central axis and which extends centrally through the securing tab, wherein the second angle (β) ranges from 55° to 65°.
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