Product description: 1, General flush valve with PVC or plastic flapper (A2101, A4202, A4206) Feature: Overflow pipe is max 274mm length, both beaded chain and stainless steel chain are available, silicon seal is free from leaking, flapper color available are orange\blue\black\green. It?s suitable for both one piece toilet tank and two pieces. 2, Flush valve with time-lapse shut-off system (A2331) Feature: Special for one piece toilet and has refill pipe. Its different beaded chain and stainless steel chain meet your different needs. Water flush amount and shut-off time are adjustable by a adjust nut on adjust cup. Silicon seal prevents from leaking. Easy to install in your tank. 3, Advanced single/Dual flush valve (A2402, A24301, A24084, A2411, A2430, A2450, A2431) Feature: Top push button, it could stop flushing when you push the button again. The overflow pipe is available in any height. Material of flush valve body: ABS which is durable and non-corrosion. Adjustable flush capacity by turning scale on valve body.