1. keeping hooked the screen, match the inlet with the invert pipe [1] and check the level:

   
   
   
   
   

B. once the levels are ok, put on the collar bracket [2]

 wheels [3] should be already installed; you should have enough room to insert the railway [4] and place it in the final position. Holding it for a while, you will drill the wall [5] and insert the anchor bolts [6]