A displacement pump comprising: an intake valve having a first intake configured to receive fluid and a first discharge; a pump cylinder comprising: a second intake, a second discharge , and a driving opening , wherein the position of the second discharge is defined as being lower than the position of the driving opening, wherein the second intake is secured to the first discharge, and wherein the second discharge projects radially outward from an exterior of the pump cylinder; and a clamp disposed about the pump cylinder between the second discharge and the driving opening, the clamp configured to secure the displacement pump to a housing, wherein the clamp comprises: an axial ring disposed on the exterior of the pump cylinder and fixed to the pump cylinder; and a tightening ring movably disposed on the exterior of the pump cylinder and below the axial ring , the tightening ring being configured to change a size of a gap disposed axially between the axial ring and the tightening ring, such that the tightening ring and the axial ring may exert a clamping force on a portion of the housing. an intake valve having a first intake configured to receive fluid and a first discharge; a pump cylinder comprising: a second intake, a second discharge , and a driving opening , wherein the position of the second discharge is defined as being lower than the position of the driving opening, wherein the second intake is secured to the first discharge, and wherein the second discharge projects radially outward from an exterior of the pump cylinder; and a clamp disposed about the pump cylinder between the second discharge and the driving opening, the clamp configured to secure the displacement pump to a housing, wherein the clamp comprises: an axial ring disposed on the exterior of the pump cylinder and fixed to the pump cylinder; and a tightening ring movably disposed on the exterior of the pump cylinder and below the axial ring , the tightening ring being configured to change a size of a gap disposed axially between the axial ring and the tightening ring, such that the tightening ring and the axial ring may exert a clamping force on a portion of the housing. a second intake, a second discharge , and a driving opening , wherein the position of the second discharge is defined as being lower than the position of the driving opening, wherein the second intake is secured to the first discharge, and wherein the second discharge projects radially outward from an exterior of the pump cylinder; and a clamp disposed about the pump cylinder between the second discharge and the driving opening, the clamp configured to secure the displacement pump to a housing, wherein the clamp comprises: an axial ring disposed on the exterior of the pump cylinder and fixed to the pump cylinder; and a tightening ring movably disposed on the exterior of the pump cylinder and below the axial ring , the tightening ring being configured to change a size of a gap disposed axially between the axial ring and the tightening ring, such that the tightening ring and the axial ring may exert a clamping force on a portion of the housing. an axial ring disposed on the exterior of the pump cylinder and fixed to the pump cylinder; and a tightening ring movably disposed on the exterior of the pump cylinder and below the axial ring , the tightening ring being configured to change a size of a gap disposed axially between the axial ring and the tightening ring, such that the tightening ring and the axial ring may exert a clamping force on a portion of the housing. <EOS>