3½" (3.1/2")/90mm x 4"/100mm Connector with 'O' Seal Socket to fit any McAlpine Rigid or Flexible WC Connector with 4"/110mm rubber outlet seal when rubber seal is removed. Size: 4"/110mm Please Note: Finned seal spigot for internal connections to cast iron, plastic or clay 4"/110mm pipe. Ideal for low level connections. With 1½" (1.1/2") Universal Pipe Boss including Blanking Cap.