Right rear inner tube for BOB Rambler Strollers manufactured on or before 6/1/18. This is the "bent-valve" (or L-valve) inner tube.
Notes from BOB: If an "after" 6/1/18 DOM (Date Of Manufacture) right wheel is used to replace a "before" 6/1/18 right wheel then the customer may get the wrong tube if one is ordered at a later date. They may be sent a "before" 6/1/18 tube with an L-Valve (because of their stroller DOM), but this will not work with their new wheel as they will need the straight-valve tube. Basically look at your stroller and examine the valve stem to see if it is straight or bent and order accordingly.