TOTO THU500S Universal Replacement Toilet Tank Flapper
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The TOTO THU500S is a genuine OEM universal replacement flapper designed for TOTO toilet tanks, sold new in original retail blister packaging. The flapper body is constructed of red rubber/polymer with a domed profile and an adjustable arrow-setting mechanism (positions 1–8 molded into the cap) that allows the user to fine-tune flush volume by rotating the cap to control water release rate. It mounts via two black plastic side ears that hook onto standard TOTO overflow tube pegs, and includes a stainless steel link chain with a metal clip for attachment to the flush lever arm; chain length and lever hole position are adjustable per the toilet model chart printed on the packaging. Per the packaging, THU500S supersedes and replaces THU138S, THU175S, THU331S, THU140S, THU299S, THU253S, THU277S, THU347S, THU275S, THU332S, THU369S, and THU499S, covering a wide range of TOTO CST and ST tank models; assembled in Mexico with US components per label.
Product Specifications
| Brand | TOTO |
| Part Number (MPN) | THU500S |
| UPC | 739268326958 |
| Condition | New |
| Flapper Color | Red |
| Ear/Mount Type | Dual side-ear pegs, black plastic |
| Chain Included | Yes – stainless steel link chain w/ clip |
| Adjustment Setting | Arrow positions 1–8 (molded on cap) |
| Assembly Origin | Assembled in Mexico w/ US components |
| Replaces | THU138S, THU175S, THU331S, THU140S, THU299S, THU253S, THU277S, THU347S, THU275S, THU332S, THU369S, THU499S |
| Compatible Toilet Brands | TOTO |
| Compatible Tank Series | CST and ST series (see model chart on pkg) |
| Manufacturer | TOTO USA, Inc., Morrow, GA 30260 |