A system of jointing reinforced thermosetting resin pipe, comprising: a first RTR pipe having a first spigot portion, the spigot portion including a first joining surface, which is tapered, wherein a portion of the first joining surface comprises external grooves; a second RTR pipe having a second spigot portion, the second spigot portion including a second joining surface, which is tapered, wherein a portion of the second joining surface comprises external grooves; a coupler having a first socket portion at a first end and a second socket portion at a second end, each of the first and of the second socket portion including an internal joining surface which is tapered, wherein a portion of the first and of the second internal joining surface comprises internal grooves, wherein a wall thickness of the coupler increases from each end to a center portion due to the tapered internal joining surfaces; a first cavity between a portion of the first joining surface and of the first internal joining surface, the first cavity formed when the first spigot portion is push-fit into the first socket portion and abuts the internal joining surface of the first socket portion of the coupler; a second cavity between a portion of the second joining surface and of the second internal joining surface, the second cavity formed when the second spigot portion is push-fit into the second socket portion and abuts the internal joining surface of the second socket portion of the coupler; an injectable and curable material located in the cavity, wherein the system of jointing further comprises a resistance wire applied to at least one of the first joining surface and the second joining surface, wherein the first joining surface and the second joining surface are mating surfaces. a first RTR pipe having a first spigot portion, the spigot portion including a first joining surface, which is tapered, wherein a portion of the first joining surface comprises external grooves; a second RTR pipe having a second spigot portion, the second spigot portion including a second joining surface, which is tapered, wherein a portion of the second joining surface comprises external grooves; a coupler having a first socket portion at a first end and a second socket portion at a second end, each of the first and of the second socket portion including an internal joining surface which is tapered, wherein a portion of the first and of the second internal joining surface comprises internal grooves, wherein a wall thickness of the coupler increases from each end to a center portion due to the tapered internal joining surfaces; a first cavity between a portion of the first joining surface and of the first internal joining surface, the first cavity formed when the first spigot portion is push-fit into the first socket portion and abuts the internal joining surface of the first socket portion of the coupler; a second cavity between a portion of the second joining surface and of the second internal joining surface, the second cavity formed when the second spigot portion is push-fit into the second socket portion and abuts the internal joining surface of the second socket portion of the coupler; an injectable and curable material located in the cavity, wherein the system of jointing further comprises a resistance wire applied to at least one of the first joining surface and the second joining surface, wherein the first joining surface and the second joining surface are mating surfaces.