Liberty's new Pro series access riser is a convenient chamber for all your pump's electrical and piping connections-out of sight and below grade. The access riser simply slides over the sealed PRO370 or PRO380 system. The cover is retained by four stainless steel bolts and features a twist-lock design with provision for padlock to deter unwanted entry. Liberty Pumps®, ARC18, For Use With: Model PRO370 Series Simplex Sewage System and PRO380 Series Riser System