Some of the "compatible" replacement tips receive reviews of not fitting, being difficult to remove and/or twisting in the WaterPik. In my case at least, they come in and out easily, stay in place during use, and seem to do the same job as name brand parts.
π¦ Satin Black WaterPik Waterflosser Cordless Plus for efficient oral care
40 Review
WaterPik WP-450 Irrigation, white/white
36 Review
π¦· Ultra Waterpik WP-112 Water Flosser for Superior Oral Health
83 Review
Enhanced Dental Care: Philips π¦· Sonicare Airfloss Ultra, HX8432/13, Black Edition
40 Review
π± Organic Peppermint and Parsley Oil Gel Capsules for Fresh Breath - Keto Friendly Stomach Mints with 3+ Hour Freshness - XL Size - Freshies
12 Review
The Legend of Zelda: Breath of the Wild game for Nintendo Switch, cartridge
20 Review
Breath Me TM 50pcs Black Fiber Reed Diffuser Refill Sticks 12 inch - Elegant Home Fragrance Replacement
11 Review
π TheraBreath Fresh Breath Chewing Gum: ZINC with Citrus Mint Flavor - Pack of 6 (10 Count)
11 Review