Diaphragm Rebuild Kit D10-HD D22-HDA Compatible with HD-1 HD-2 HD-3 HD-4 HD-5 Engines Applications: Compatible with Engines HD-1, HD-2, HD-3, HD-4, HD-5, HD-6, HD-7, HD-8A, HD-9A, HD-10, HD-11A, HD-12, HD-13, HD-14, HD-15B, HD-16, HD-17A, HD-18B, HD-19B, HD-21B, HD-22, HD-23, HD-27 & HD-28A. Compatible with Engines 42, 44, 133, RS51, 234, 238, 242, 250, 250RX, 252RX, 254, 262, 262XP, 450, 525, P901, 2054, 2055, H245, H340, H345, H346, H350, H351, 359. Compatible with Engines 027, 028, 029, 039, 044, 046, 1127, 1128, 1133, 4203, MS270, MS280, MS290, MS341, MS361, MS390, MS440, MS441, MS461, SR360, BR320, BR400, BR420. Package Includes: 1 x Diaphragm Rebuild Kit. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.