Description Toto THU129 Flush Valve Replacement with Adjustable Sliding Overflow Tube by NuFlush   Toto THU129P-2A, THU129W-1A, THU129W-4A, THU129W-5A 3 inch Two piece Valve with Installation Hardware Overflow Extension Tube Adds More Water to Your Toilet Tank for a More Powerful Flush Save Water When You Only Need to Flush Once Fits New Style Promenade, Drake, Mercer, Nexus and Vespin models