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TOTO Aquia IV ARC Dual Flush 1.28/0.9 GPF Universal Height Toilet Auto Flush Option with S550e Bidet Seat MW4483056CEMFGN#01


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Our Price: $1,981.00
Regular price
List Price: $2,830.00
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Our Price: $1,981.00
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Returns: 30 Day Returns & Exchanges.
Shipping: Free Standard Shipping to the continental United States. See our Shipping Policy for details. Contact us for additional delivery options.
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The TOTO WASHLET+® Aquia IV ARC Two-Piece Elongated Dual Flush 1.28 and 0.9 GPF Toilet and Contemporary Auto Flush WASHLET® S550e Bidet Seat is designed to conceal the WASHLET® power cord and water supply hose for a seamless installation.

The WASHLET® S550e features TOTO's technologically advanced EWATER+® system that mists the wand and toilet bowl, reducing the need for harsh cleaning chemicals. PREMIST® wets the surface of the toilet bowl, aiding in the removal of waste and resulting in a better clean.

The TOTO WASHLET® S550e is operated by a luxury style illuminated touch pad remote with 2 user memory to save preferred settings. The WASHLET® features 5 spray settings, auto open and close lid, heated seat, a nightlight, and instantaneous water heating.

The newly redesigned lid style resides flush with the toilet bowl, providing a streamline look and giving the impression of an integrated system. This minimalistic display provides a more subdued appearance to your WASHLET®. The curved tank design coupled with the skirted bowl create a sophisticated look and minimizes the need to reach behind the bowl to clean in between the nooks and crannies of the exterior trapway.

The Universal Height design allows for a more comfortable seat position across a wide range of users. The Aquia IV features TOTO’s DYNAMAX TORNADO FLUSH®, utilizing a 360 degree cleaning power to reach every part of the bowl. This version of the Aquia IV includes CEFIONTECT®, a layer of ceramic glaze that minimizes waste from sticking to ceramic surfaces. CEFIONTECT®, EWATER+®, and DYNAMAX TORNADO FLUSH® create a synergy that optimizes flush performance to reduce the frequency of toilet cleanings, minimizing the usage of water, harsh chemicals, and time required for cleaning. The enhanced design of the Aquia IV inner bowl reduces water flow resistance and turbulence, resulting in a quieter flush.

New Auto Flush kit provides a hands-free automatic flush after every use. No need to touch buttons or handles, and never worry about someone forgetting to flush. Allows you to proactively conserve water by choosing between a 0.9 GPF rinse or 1.28 GPF for tougher jobs.

The Aquia IV comes ready for install into a 12" rough-in, but may be adapted for a 10" or 14" rough-in with the purchase of a separately sold adapter. Additional items needed for installation must be purchased separately: wax ring, toilet mounting bolts, and toilet water supply lines.


      • WASHLET+® bidet seat and two piece toilet, exclusively designed to work with a T40 WASHLET+ bidet seat
      • Conceals the WASHLET water supply and power cord for seamless integration
      • Hands free automatic flush system
      • EWATER+® mists the wand and toilet bowl, reducing the need for harsh cleaning chemicals.
      • PREMIST® wets the surface of the toilet bowl, aiding in the removal of waste and resulting in a better clean.
      • Front and rear warm water washing with five adjustable temperature and pressure controls
      • Oscillating or pulsing stream option
      • Auto open/close lid and heated seat, automatic air deodorizer, nightlight, and warm air dryer with five adjustable temperatures
      • Tankless, instantaneous water heating means never running out of warm water
      • Luxury style illuminated touch pad remote with 2 user memory to save preferred settings
      • DYNAMAX dual flush technology: powerfully and quietly reaches every part of the bowl with 1.28 or 0.9 gallons per flush
      • Two-piece, skirted design elongated bowl
      • Universal Height creates greater comfort across a broader range of individuals
      • WaterSense®, CALGreen, and CEC compliant
      • 12" Rough-in.
      • May be adapted for 10" or 14" rough-in with optional TOTO parts: TSU48.10 or TSU48.14 (sold separately)
      • Included parts: WASHLET® installation hardware, Auto Flush kit , tank to bowl gasket, tank to bowl hardware, and toilet bolt caps
      • Purchased separately: wax ring, toilet mounting bolts, and water supply lines.

S550e Washlet Bidet Seat

      • Compact and slim design high-tech electronic bidet seat
      • Wireless remote-control with easy-to-read illuminated touch pad, 2 user presets and a magnetic wall mounted cradle
      • Warm water with oscillating and pulsating spray, five spray settings, four wash modes, adjustable water temperature and pressure for a soothing, aerated wash stream will live you feeling relaxed, clean and confident
      • Built-in automatic air deodorizing system
      • Convenient slim wireless remote, with 2-user personal memory settings, illuminated touch pad and convenient magnetic wall mounted cradle
      • Instant water heating system for continuous warm water
      • Docking station for easy cleaning and installation
      • EWATER+ automatically sterilizes the bowl and wand with each use
      • Heated seat with temperature control
      • PREMIST® feature coats the bowl with water prior to use for a cleaner flush.
      • Warm air dryer with five variable temperature settings
      • Energy saving mode
      • Available with auto-flush compatibility with compatible WASHLET+ toilet models and auto flush kit (See Above Option)
      • 1-year limited warranty

Warranty: Because we are a TOTO Authorized Dealer, you are entitled to their standard 1 Year Limited Warranty.

Prop 65 information for California residents.

There are plenty of resources to help you pick the right bidet, install it and maintain it for years to come. Remember, you can always reach out to us with any questions.


Free Standard shipping via UPS Ground or USPS is included with all orders delivered to the contiguous 48 United States.  Your order will be processed with in 1-2 business days. The estimated delivery time will be approximately 5-7 business days from the time of order.  Read EverFlow Bidets' Shipping Policy.

*Delivery to Canada, Alaska, and Hawaii is available for an additional Shipping and Handling fee.  Please Contact Us for additional shipping information. 


We accept returns on new and unused products within 30 days of shipment date.  Returns must be initiated by the customer and require an RMA number issued by EverFlow Bidets Customer Support. Customers are responsible for return shipping costs. Returns must still be in their original packaging with all parts and accessories included or you may be subject to a 20% restocking fee. Bidet seats and integrated units that have been installed and used are non-refundable due to governmental regulations pertaining to personal hygiene productsRead EverFlow Bidets' Return Policy.

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