For ONEOK Partners it's OK to have three businesses: natural gas pipelines; gas gathering and processing; and natural gas liquids (NGLs). Its pipelines include Midwestern Gas Transmission, Guardian Pipeline, Viking Gas Transmission, and OkTex Pipeline. The ONEOK affiliate operates 17,100 miles of gas-gathering pipeline and 7,600 miles of transportation pipeline, as well as gas processing plants and storage facilities (with 52 billion cu. ft. of capacity). It also owns one of the US's top natural NGL systems (more than 7,200 miles of pipeline). In 2017, 41%-owner ONEOK agreed to buy the stock of ONEOK Partners that it did not already own for $9.3 billion in a stock deal.