Liberty Pumps has expanded its 370-Series line with the addition of a new access riser. The riser, designed exclusively for the 370-series system, allows burial up to 18" below grade and provides a convenient chamber for all electrical and piping connections. Made of durable molded polyethylene, the riser features a twist-lock style cover, pad-lock feature and four stainless steel bolts. Also available from Liberty are 2" installation kits with all the necessary components for a professional installation. Liberty Pumps. Circle 30.