Where is the manifold ?
Answer KT, The manifold 154824201 Is the tube that runs up the back of the tub on the inside , the top and middle spray arms attach to it.
How do I get the spray arm to stay on?
Answer Hello KT. The spray arm twist and locks into place on the unit. If yours is not locking into place, the spray arm or manifold may need to be replaced in the unit.