Triton electric shower leaking? Pressure Relief Device (PRD) 82800450 repair kit

Does this item fit triton jade 3?

My triton shower keeps switching from hot to cold and back to hot with the low presure light coming on when it goes cold when i first switc????

What comes with this, the balls and the rings. my shower is shooting water from the bottom. is that all i will need or will i need the plastic parts?

Triton ti 90 shower head is dripping all the time what parts do I need