Most people are not aware that airless paint spray hose performs another important function apart from transporting pressurised paint from the airless pump to the airless spray gun. All airless spray pumps, be they piston pump design or diaphragm type airless paint pumps will introduce pulsing into the stream of paint. If this pulsing is not treated and smoothed out by the time it reaches the airless spray gun it can become evident in the spray pattern.