Direct Replacement: The C-100500-K kit is specifically designed as a replacement for Power Flush Toilet systems. Compatible for models including M-101526-F3 and M-101526-F4, ensuring a for your pressure assist tank systems. Broad Compatibility: This flush valve piston assembly is suitable for series, including 500, 501, 501A, 501B, 503, and 504. It seamlessly integrates with for I - 501/501A, II - 501B, III - 503, and IV - 504 series, making it a versatile choice for toilet repairs. Enhanced Durability: Constructed from robust ABS materials, this flush kit offers exceptional durability and reliability. Simple Installation: Installing the C-100500-K Kit is straightforward and requires no special tools. Simply remove the old and replace it with the assembly. The high-quality materials used are heat and wear , ensuring and ease of maintenance. Color:White Material:plastic Package Contents: 1 * C-100500-K Replacement Flush Valve Assembly Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.