NoneInstructions say we must user rubber washers on each side of T connector and hose. Only one washer is provided. The hose holder holes are too big for the screws provided and can’t be used if you decide to hang it on the side of the toilet seat. I’ve installed the hose, now waiting to see if it leaks. Will likely be returnedThis is great however the trigger is a little sensative.Thank youThis is excellentI bought this in May. We thought we installed it wrong so we kept tinkering with it but it was no use. It leaks like no one’s business. It would create puddles and now my baseboard is damaged because of it.With the pandemic and the toilet tissue shortage, plus the wet wipe issue that is happening to many sewer systems I found this very useful and hygienic. The sprayer is powerful and easy to use. Fortunately my neighbors son is a plumber and was available to do the install. I use this product daily.The hose is way too long. It just looks very odd. It’s not a garden hose, it doesn't have to be so long!~3 months after the first use, it started leading and I need to change it. There are other much better options on amazon (one of which I bought for my other bathroom and I'm very happy about).Keeps breaking and leakingWe transitioned from a toilet seat with a bidet built in to this hand held sprayer and I am so happy we did. You can adjust the strength of the sprayer by the amount of tension you put on the handle which is nice. I love it, it also makes cleaning the toilet so much easier which is an added bonusThe part that attaches to the toilet is leaking. I tried a few different methods to stop the leaking such as replacing the washer with a new one and using a different sealing tape. Nothing worked.It was OK for a month and this morning I noticed the clear plastic started bubbling out of the seams of the metal casing.