hello every body just need a little help not sure if i do or not.when i press on the foot peddle on mycommode i hear a clicking sound just one click.so do i need any help or not. thank you. since im here another problem i have presser relif valve is leaking on my water heater. i have a new one for it. is there anything i should know how to change it.besides turning the water off and opening the forcest to take the pressure off of it.i didnt open the forcest one time what a suprize i had and a mess on me.while im changeing it ill put a couple of gals of vinegar in it to clean it out. thanks fo your help.be carefull out there.we are to old not to wear are mask.