Designed and meant to be used as a horizontally mounted assembly. This includes feet on the pump, motor or both for securing the pump and motor to its floor or structure. The most common type of Horizontal pump is the End Suction, where the fluid enters the front end of the casing and exits perpendicularly. The source of liquid is either above the pump, in which case it is a positive head and no special priming is needed. If the liquid source is below the pump then either a priming chamber is needed or use of some sort of suction side valve, i.e. foot valve, to maintain prime in an open pumping system. If the inlet and outlet go into the same tank, i.e. re-circulating or filtering, and the lines are kept below the surface level, then after initial priming the system will maintain its prime. The two big considerations that must be given to horizontal pumps is priming method and NPSHa. Typical Centrifugal Horizontal pumps include mechanically sealed, magnetic coupled seal-less, self-priming, multistage, jet, back pullout, portable, API and ANSI to name a few.