How does the outward-swing U-shape door latch and seal against water pressure?

An outward-swing U-shape door on an Ella walk-in tub is held shut by its latch, not by the water: turning the outside handle drives gears on a shaft that push three tapered locking pins out of the door and into the frame, and the taper of those pins pulls the door evenly into its silicone seal all the way around. Because the pins do the compressing, the seal is just as tight with the tub empty as it is with the tub full, which is the opposite of an inward-swing door that needs the weight of the water to press it closed. The mechanism itself is described in What Is a Gear-and-Shaft Latch (2-Latch and 3-Latch) on a Walk-In Tub?, and this page explains how that latch becomes a watertight seal, what you feel at the handle, and what to check when the seal stops holding.

Why an Outward Door Needs Its Own Way to Hold the Water

On an inward-swing door the water is on the helpful side of the door. As the tub fills, the water presses the door against its gasket, and the door cannot be pulled open until the tub has drained. An outward-swing door opens away from the tub, so the water pushes the door away from the frame instead of into it. Something else has to hold the door back against that pressure, and on the U-shape door that something is the 3-latch gear-and-shaft latch.

The video on this page compares the door to a vault door. When a vault closes, the pins come out and everything inside is safe. When the U-shape door closes, oversized pins travel into the jamb of the tub in the same way. The point of the design is that once the door is closed and locked it does not move or shift as the tub fills. The seal you have at the moment you lock the door is the seal you have when the water reaches the top of the jets, and the video states plainly that this door will not leak when it is installed and aligned correctly.

What Happens as You Turn the Handle

1. Pull the door closed and begin rotating the handle. At the start of the handle's travel the pins are only just entering the frame, so they need light pressure. The video describes this as a very gentle amount of pressure to get the door started.
2. Keep rotating. Gears on the shaft drive the three tapered pins further into the openings in the striker plate on the frame. Because the pins are tapered, each bit of extra rotation puts a little more pressure on the seal.
3. Complete the full turn. The video shows the handle rotating a full 180 degrees. At the end of its travel the pins are fully seated and the taper has pulled the door evenly into the gasket around the whole loop. On a U-shape door the handle faces toward the hinges when locked.

The tapered pins are doing the work, not your hands. The video makes this point for anyone with limited mobility or limited hand strength: you supply only the gentle starting pressure, and the mechanism supplies the sealing pressure. A handle left halfway means the pins are only part way in and the seal is only partly compressed, so finish the turn every time. The handle position is your check, because when it faces the hinges the pins are home.

Why the Seal Holds the Same Whether the Tub Is Empty or Full

On this door the seal compression comes entirely from the pins. Water pressure adds nothing to it and takes nothing away from it, which is why the seal is just as tight when you close the door as it is when the tub is completely full. The U-shape door opens through a 165 degree outward arc and is a plastic composite frame holding a tempered glass panel. It is fitted to the Capri, Monaco, Front Entry, Mobile, Lounger, Shak, Big4One, Tub4Two and Big4Two.

The same family of mechanism, with two pins instead of three, is on the aluminum door of the Transfer tubs, which opens through 172 degrees. What Is an L-Shape Transfer Door on a Walk-In Tub? covers that door, and the same rules about completing the handle turn and keeping weight off the open door apply there too.

The Drain-First Rule, and Why It Exists

Nothing about the water stops the handle from rotating. The pins retract only when the handle is rotated fully back to the open position, and if someone does that with water in the tub, the door unlocks. That is why every Ella manual gives the same instruction for outward doors: never open the door until the tub has completely drained. Can an Outward-Swing Walk-In Tub Door Open Before the Water Drains? explains the difference from an inward door in more detail.

Two features of the design make accidental opening unlikely. The handle sits on the outside of the door, away from the bather, and the pins only retract at the very end of the handle's travel, so a bump or a partial turn does not release the door. Where a helper operates the door for a bather, make sure they understand that the handle stays in the locked position until the tub is empty. On the Lounger the outside handle can be removed; ask the team whether that approach suits your model and household. Can Someone Open the Walk-In Tub Door While It Is Full and Flood the House? walks through the options for assisted bathing.

When the Seal Stops Holding: What to Check

Because the latch has no screw that tightens or loosens the pins, a door that leaks or has to be forced is telling you that something upstream of the latch has changed. Work through these in order:

• Every leveling leg. Ella tubs have at least six leveling legs, and each must rest solidly on the floor with no gap beneath it. When a leg hangs free the shell bows, the door rubs the jamb, the pins drift away from the striker plate openings, and the gasket may not touch on the lower handle side, which is where most door leaks begin. If the tub is bowed down in the center, the center leg is extended until the door frame clears the swing of the door.
• The full handle turn. Confirm the handle reaches its locked position facing the hinges. A handle that stops short leaves the seal partly compressed.
• The handle lock nut. Behind the front apron, the lock nut is set so the handle moves smoothly yet still pulls the door firmly into the seal. How do you adjust the 3-latch gear lock on an outward-swing door? lays out what can be adjusted and what must not be touched.
• Weight on the open door. Never lean on the door or use it as a handhold. The door and seal warranty is valid only when the alignment of the tub and door is correct and has not been changed by a bather's weight.

Adjusting anything at the handle on a tub that is not level only masks the problem. If the pins still miss the striker plate openings, or the plate itself has loosened, open a ticket at ellasbubbles.com/support or call (800) 480-6850 with your model name, your order details from where you purchased, and photos of the pins, the striker plate, the handle and the seal, and the team will confirm whether an adjustment or a part is needed.

Watch: Advanced Door Locking System for Walk-In Tubs for Maximum Safety: Voted Safest 2020 | Ella’s Bubbles with chapters and a full transcript.

Related Guides

• How Do I Adjust the Door Latch So the Door Seals Without Forcing?
• Door Handle Loose, Wobbly or Hard to Turn: Tightening the Bolt Under the Cap and Adjusting the Lock Nut
• Caring for Your Door Seal: Cleaning, Reseating, and Replacing the Gasket

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