Many items we buy require it to be (a) properly installed, and/or (b) properly maintained.
Car warranties only work if service and use requirements are adhered to. To reduce risk of claim rejection it is best to use main agent.
Central heating boilers need servicing annually - even if there is nothing wrong. Law requires electrical and gas work to be properly compliant.
Some items include frankly daft requirements to minimise health and safety claim - eg: ladders, DIY kit,
My local garden centre gives a 5 year warranty on plant quality - providing you (a) keep the original receipt, and (b) plant and water correctly (not sure how you prove this)
The requirement of the seller of your wheel bearing to prove it has been properly fitted is reasonable - he may sell many items where a failure in fitting is (a) much more likely and/or (b) much more costly to rectify.
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