Ban Jing decompression Hose Kit. This kit is for highly modified engines who have too much compression. This kit allows you to release that compression thru the dip stick. Now this kit is not for stock engines or even moderately modified engines. Will do nothing but cause issues for you. The hose must be set up at the scooters highest point. Some people choose to connect it to a oil catch can as for some engines oil can come out of it.