Bio Bidet Ultimate 770 Installation Guide (Exact Steps)


Today, we’re installing the Bio Bidet Ultimate 770 (or U770). See the extensive U770 review here complete with demos. If you’re ready to purchase it, click here (Amazon link).

Every step has a short video to illustrate what needs to be done. After all, a picture is worth a thousand words, so a moving picture must be worth 10,000.

Bio Bidet Ultimate 770 Installation Instructions

Gather the Needed Tools

You’ll need a Phillips head screwdriver for the mounting plate (the part that holds the bidet to the toilet) and you’ll probably need a flathead screwdriver to pop the covers off of the toilet seat mounting hardware. And, you’ll need a flathead or Phillips to remove your current toilet seat mounting bolts.

I recommend getting a towel or a small container to catch water. Also, get a rag or rubber jar gripper for hand-tightening purposes.

Set all this aside for now.

Finally, the power cord on the bidet is only about 4 feet (approx. 3.9′ or 1.2m). So, unless you have an outlet within reach, you’ll probably need an extension cord.

It’ll need to be a three-pronged extension cord like the one above. They make bidet extension cords, but any three-pronged cord will do.

Shut Off the Water and Flush the Toilet

Look for a small valve that protrudes from the wall or floor on the lower left-hand side of the toilet, and turn the valve clockwise.

Now flush the toilet and hold the lever down until you hear it stop draining. This will mostly empty the toilet tank, but some dripping will occur when you remove the hose in the next step.

Remove the Water Supply Hose from the Toilet Tank

Find the hose that attaches to the toilet tank. It is attached to a threaded shank which is part of the toilet fill valve.

With traditional 2-piece toilets, the hose typically extends from the bottom of the tank. In some cases, it attaches to the back of the toilet.

If you have a skirted toilet that conceals the water connections, you might not be able to see where the hose attaches. If so, you’ll need an extension hose or alternative T-valve for skirted toilets.

Place the towel or container on the floor underneath the hose and grip the hose (with the rag or rubber gripper), twisting it clockwise. (Note: when looking at your hands, it will appear CW. If looking from underneath, it would be CCW).

Alternatively, you can loosen the hose, then hold the towel or container up close to catch the water while you finish removing the hose.

Install T-Valve and Attach the Hoses

First, ensure that the o-ring is oriented correctly. When I removed the T-valve from the small bag, the o-ring was already in place.

If the o-ring isn’t already in place, make sure it is situated right side up and placed inside the T-valve as in this picture.

Thread the T-valve onto the toilet fill valve (the threaded shank). Use a rag or gripper to tighten it to about 80%.

Before fully tightening the T-valve, ensure the horizontal port is pointing towards the bidet seat, like so:

The T-valve allows the water from the shutoff valve to be split between the toilet tank and bidet.

Hand-tighten firmly while making sure the horizontal port of the T-valve doesn’t move out of place.

Now, attach the hoses. You can do this in any order, but attach the bidet hose to the horizontal T-valve port and the water supply hose (the one you removed from the toilet tank) to the bottom of the T-valve.

Remove the Existing Toilet Seat

Most toilet seats are held in place by white plastic screws and fasteners. The fasteners are underneath.

If that describes your toilet seat, you’ll probably need to use a flathead screwdriver to pry open the flaps that cover the screws, like so:

Now, remove the bolts.

Grip the fasteners on the underside and turn the screwdriver CCW to remove the bolts. After loosening the bolts, it may be easier to hold the screwdriver in place and remove the fasteners by hand.

Not every seat is like this. In the second example in the video, the bolts and toilet seat are permanently fixed. In that case, I simply needed to unscrew the fasteners by hand.

Finally, toilets with skirted trapways typically use top-mounting bolts:

(This bidet came with top-mounting bolts, aw we’ll see in the next step)

If your current toilet seat uses these, there are no fasteners on the underside that need to be held down. Just use the screwdriver to remove the bolts.

Set the seat aside for now.

Insert the Rubber Nuts Into Bolt Holes at Back of Toilet Rim

Turn the water on warm and remove the black rubber mounting nuts from the bag.

Run one of the rubber nuts under warm water for a bit until it’s noticeably more flexible.

Insert the rubber nut into one of the bolt holes and repeat on the other side with the other rubber mounting nut.

Attach and Align the Mounting Bracket at the Back of the Toilet Rim

Locate and place the plastic mounting bracket over the back of the rim with the arrow facing up and pointed towards the toilet tank.

With the arrow facing up, the grippers will be on the underside to keep the plate from sliding over time.

Put a bolt through a washer and then through a bracket holder like so, with the curved end of the bracket holder facing up.

Now, grab the Phillips screwdriver and thread the bolts into the rubber top-mounting fasteners. With top-mounting hardware, you don’t need to hold the fasteners on the underside while turning the screws.

Tighten most of the way, but stop before finishing.

Now count the number of grooves above or below the bracket holder and make sure it’s the same number on both sides (see the video). This ensures the mounting plate will be level when tightened down.

Now tighten the rest of the way.

Once you attach the bidet, you may find that it’s positioned too far back or forward. If so, you’ll need to loosen the bolts and move the bracket holders farther back or farther forward.

Mount the Bidet Seat

Go ahead and mount the bidet onto the toilet, but don’t plug it in yet at this point.

Position the bidet seat snuggly up against the mounting plate. Push it towards the plate, giving the seat a slight jiggle until you feel it catch (i.e., the bracket sliding into the grooves under the bidet seat).

Now, push the bidet the rest of the way until you hear a click.

Attach the Bidet Hose

Locate the bidet side of the braided metal hose and the L-shaped water inlet on the right-hand side of the bidet.

Attach the hose to the bidet and tighten snuggly.

Open the Water Valve

Locate the valve you tightened in the beginning (when turning the water off), and turn the valve CCW. Once the valve is open, check for leaks along the paths of the two hoses.

Look for leaks at the T-valve and bidet. If anything is leaking, the connections either need further tightening or they may need to be removed and re-tightened.

Plug It in and Test It Out

Plug the bidet into the outlet or extension cord. The bidet should turn on automatically, causing the nozzle to extend and retract.

This bidet uses an advanced reservoir heater, so I’d give it a few minutes before trying the warm water function.

Conclusion: Bio Bidet U770 Installation

There you have it.

Hopefully, you found the article useful.

If you have an odd toilet design and run into scenarios not covered/mentioned above, make sure to check out other bidet installation articles.

That’s it for now. Thanks for reading.

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