A septic system is an easy thing to lose. With servicing being spaced sometimes years apart and with it being underground with no indication of it's placement, never has "Out Of Sight, Out Of Mind" been so applicable. With Risers, now you won't have to worry about losing your tank or wondering what the state of it is. A "riser" is a plastic access port that is sealed weather tight against the elements. After installation all you have to do is take off the lid and access to your tank(s) is now open. Never worry about losing or having to dig up your septic tank(s) again!