Hi Gary I also use waterpic w100, and had a hard time finding the correct tip, some just didn't fit . I found http://www.ethicare.com, Type U Connector (use with Water-Pik® Ultra (WP-100W) AHUN Nasal Irrigator $21.00 (+5.95 S/H)=$26.95 I also tried one of the bottle setups, works fine, but I like th...

I just ordered a spare, and it's an infineer DT3500, sdame as before. Cost is 47.50, and their site is

http://www.cpapusa.com/search.php?category=software

Good luck, Bob

I bought a full set of Nasal Aire II nose pieces and onlyu use the large. I tried the MP for about a week, and I am willing to donate all tips except large to anyone who can use them. Thanks , Bob