129 series hot tap plugging system Video

http://www.petersenproducts.com/129-0_pipe_plug.aspx - The 129 Series Multi-Flex™ Plug is installed downstream of the hot tap. This allows the plug launching system to also by-pass flow upstream of the Plug. The 129 Series Plug can be built for much higher pressures than the 128 Series Plug but requires a somewhat larger hot tap and inflates immediately below the hot tap.