Replacement fill valve for compatible TOTO Aquia IV toilet tanks. Compatible products include CST646CEMFGNAT40, CST646CEMFNAT40, MS646124CEMF(G)N, MS646234CEMFGN, MW6463046CEMFGN(A), MW6463056CEMFGN(A), MW6463074CEMFGN, MW6463084CEMFGN.
TOTO TSU802.13-A Fill Valve UPC Code: 739268430730.
TOTO TSU802.13-A Fill Valve for Aquia IV 1.28 / 0.9 GPF One-Piece Toilets
Frequently Asked Questions
• What if my order arrives damaged?
While we take great care in the packaging and handling of orders, we ask that customers inspect all shipments within 48 hours of delivery, and in the rare event that your order arrives damaged, please send us an email with a photo showing the damages (so we can file a claim with the carrier), and let us know whether you prefer a free replacement or a refund.
• Why do you ask for phone numbers during checkout?
Some shipping carriers, especially those handling freight, require a phone number to coordinate your delivery. We respect your privacy and guarantee that any information you provide will never be shared with third parties, except for shipping purposes.
The TOTO TSU802.13-A Fill Valve is a genuine TOTO replacement part designed for select Aquia IV one-piece dual-flush toilets. Installed inside the toilet tank, the valve controls the incoming water supply and refills the tank after each flush, helping restore reliable operation when the original fill valve becomes worn, damaged, clogged, or no longer shuts off properly.
The TSU802.13-A is compatible with select MS646 and CST646 Aquia IV toilet configurations using a 1.28 and 0.9 GPF dual-flush system, including standard, WASHLET+, and AutoFlush-compatible models. This replacement includes the fill valve only and does not include the flush valve, push-button assembly, water supply line, seals, or other toilet components. Confirm the complete toilet model before ordering to ensure proper compatibility.
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