Abstract: The present subject matter relates to a turbulence free ring (TFR), for a pipe-coupler unit. The TFR includes a main portion, forming a closed loop of predetermined diameter, webbed portions extending in an axial direction from the main portion, a fitment edge, extending in a radially outward direction from the main portion, and a raised section having a substantially flat top surface. The raised section extends in a radially inward direction from the main portion.

Abstract: The present subject matter relates to a coupler (106) for a pipe system. The coupler (106) has a first end (108) to receive one end (136) of a fixed pipe (102) and a second end (110) to receive one end of a removable pipe (104). The first end (108) is provided with first internal threads (116) corresponding to first external threads (118) on the one end (136) of the fixed pipe (102). Further, the second end (110) is provided with second internal threads (114) corresponding to second external threads (120) on the one end of the removable pipe (104). The coupler (106) has a coupler bonding surface (122) on an internal surface between a central region (138) of the coupler (106) and the first internal threads (116) of the first end (108). The coupler bonding surface (122) corresponds to a fixed pipe bonding surface (126) of the fixed pipe (102).

Abstract: The present subject matter relates to a turbulence free ring (TFR), for a pipe-coupler unit. The TFR includes a main portion, forming a closed loop of predetermined diameter, webbed portions extending in an axial direction from the main portion, a fitment edge, extending in a radially outward direction from the main portion, and a raised section having a substantially flat top surface. The raised section extends in a radially inward direction from the main portion.