Using an Inlet Strainer is the easiest way to maximize spray performance while also saving time and money by extending the life of your equipment and reducing down time. A strainer prevents foreign objects from entering into the pump and provides the first stage of filtration. 235004For Use With ST, STX, 295 ST, 395/495 ST Pro Stand, 455/495 ST Lo-Boy, Ultra Max 695/795 Lo-Boy, GM3000 Lo-Boy, 390/395/450/455/490/495 ST Stand, Ultra 600 Lo-Boy Inlet Size (in) 3/4 Inlet Thread Type UNF Model Graco Type Strainer Kit 181072For Use With Ultra Max 795/1095/1595 Hi-Boy, GMAX 3900, GMAX 5900 Lo-Boy, LineLazer 3900/5900, EM 590, Ultra 750/1000/1500, GM 3500/5000, Ultra 333/433, GM7000 Lo-Boy, LineLazer 5000 Inlet Size (in) 1 Inlet Thread Type NPSM Model Graco Type Strainer 183770For Use With 455/495 ST Pro Hi-Boy, 495 ST Hi-Boy, Ultra 500,Ultimate 500, Ultra Max 695 Hi-Boy/Lo-Boy, GM3000 Hi-Boy, LineLazer 3000/3500, GM3500 Lo-Boy Inlet Size (in) 3/4 Inlet Thread Type NPSM Model Graco Type Strainer