If a player’s board shows both a J and 4, that player must pay $2.50 to the pot or fold. A player may be saved from paying this fee if there is an 8 (“Life Raft”) separating the J and the 4. For example: a board of X-X-J-4-8 would have to pay $2.50, while a board of X-X-J-8-4 would not.
This can be required multiple times for string streets in the instances of 4-X-J-X-4 or J-4-X-J.