Profiled leak-before-press sealing ring for a press fitting with arc-shaped first type ring portions alternating with linear-shaped second type ring portions

A profiled leak-before-press sealing ring for leaving free empty leaking spaces between a socket and a pipe end of a press fitting in a non-compressed state, comprising:

• a plurality of first type ring portions;
• and
• a plurality of second type ring portions,
• wherein the first and second type ring portions lie alternating around a center axis,
• wherein the first type ring portions each extend arc-shaped around the center axis, and
• wherein the second type ring portions each extend linear-shaped with a straight inner surface and with a straight outer surface in a tangential direction that is perpendicular to a radial direction going through the center axis,
• wherein the arc-shaped first type ring portions each have a curved inner surface of a constant radius around the center axis and a curved outer surface of a constant radius around the center axis,
• wherein the ring further comprises:
• a plurality of third type ring portions,
• wherein the third type ring portions extend arc-shaped in between respective ones of the arc-shaped first and linear-shaped second type ring portions,
• wherein the arc-shaped third type ring portions each connect with one of its head ends to a head end of a neighbouring one of the arc-shaped first type ring portions, and with an opposing one of its head ends to a head end of a neighbouring one of the linear-shaped second type ring portions, and
• wherein the arc-shaped first, the linear-shaped second, and the arc-shaped third type ring portions all have a same evenly large dimensioned cross-sectional shape.