700000254 - PerformancePlus check valve cartridge, which contains a ruby ball and sapphire seat that are effective in solving sticking issues and provide excellent sealing characteristics. Its larger orifice can provide an advantage at higher flow rate. Link to 700000254
700002399 - Ceramic PerformancePlus Inlet Check Valve Cartridge, which can be used when the ruby ball and sapphire seat check valves still exhibit problems with sticking. This is an optional check valve. Link to 700002399
- 700002399 comes with a quanity of 2 per package.