It's no wonder this item is on sale.  It does not ship with all the necessary parts!  Step four of the assembly instructions state "...and insert trident".  My plumber (who has been in the business for 20 years) has never seen an assembly like this.  When I called Wayfair, I was told that a "trident valve" was a standard part carried by any hardware store.  He went to five places, only to find that not one of them had ever heard of a trident valve.  I will be returning these.  It is useless to sell products that don't ship all the needed parts, especially without disclosing that this part is not included.