Abstract: A bell and spigot connection and composite gasket seat spigot ring provides seal mainline pipes (e.g. HDPE and SRPE pipes). An upper (HDPE) spigot sleeve defines an annular groove to provide a gasket seat and is welded to a lower (HDPE) sleeve. A metal ring is received in a ring cavity defined between the sleeves. The metal ring has a height that is a substantial proportion of its width, (e.g. 50% or more). A stepped spigot surface receives a liner surface at a pipe end for welding. A bell is formed on a first pipe segment from a second pipe segment having a same construction where the second segment is larger in diameter so that an exterior surface (e.g. a top of a helically wound rib or top of annularly spaced spacer blocks) of the first segment may be welded to an interior surface (pipe liner) of the second segment.