The CAS Cube Air System is the simplest to purchase, own, and operate compressor in the world. The Cube Air System allows you to purchase a functioning compressor without having to purchase an air receiver. If the site already has a certified functional air receiver you simply install the Cube Air System next to the existing tank and connect the air discharge line. If the there is no existing tank or the existing tank is no longer certified or functional you can add a stand-alone tank to the system.