line, word of mouth, grapevine, conduit, duct, drainage pipe, oil pipeline, leader, waterway, powerline, more...

bottleneck

oil, gas, water, sewer, telephone, cable, electricity, internet, more...

new, natural, mile, inch, long, alaskan, stage, main, direct, crude, second

bulk-line system,   narrow tube,   long duct,   water conduit,   duct tube,   fluid duct,   public conduit,   transparent tube,   money pipe,   oil pipe