There is no potential risk to the patients associated with the planned intervention.The vulnerable adults with learning difficulties/Dementia and poor manual dexterity will be excluded. In the intervention arm (GROUP A: patient with valve) the patient may get a pain with strong desire to pass urine or start bypassing catheter much before 3 hours after closing the valve. In this case patients will be instructed to open the valve and drain the urine. (These patients will be excluded).