SP-281TU, LE-281 Repair and Preventative Maintenance Kit. It is recommended to replace these parts every 1 to 2 years. This Kit includes the following: 1- Part # 30917, Liquifram 1- Part # 37349, Injection Valve Kit 3- Part # 36307, Cartridge Valve Assembly 1- Part # 36107, Cartridge Valve Washer 3- Part # 26136, Clamp Ring 3/8 1- Part # 10973, Seal