Schreiber offers both open flight and tube-mounted screw pumps. The OFSP transports liquid in a concrete trough. It is a non-clog pump, typically installed at a 30- or 38-degree angle. It has a variable capacity at a constant speed up to its max. The TMSP transports liquid inside a stationary tube, simplifying design and eliminating the need for grouting. The screw pumps utilize a unique spherical roller, self-aligning capability, and a combination radial/thrust lower bearing with a minimum L-10 life of 100,000 hours.