This replacement tips fit most waterpik models, only few models are not compatible with.
Compatible Models:
Aquarius (WP-660, WP-662, WP-663, WP-665, WP-667, WP-668, WP-669)
Aquarius Professional (WP-670, WP-672, WP-673, WP-674, WP-675, WP-676)
Complete Care (WP-900)
Complete Care 5.0 (WP-861, WP-862)
Complete Care 5.5 (WP-811, WP-812)
Complete Care 7.0 (WP-950, WP-952)
Complete Care 9.0 (CC-01CD010-1, CC-01CD012-2)
Complete Care 9.5 (CC-02CD010-1, CC-02CD012-2)
Cordless Advanced (WP-560, WP-562, WP-563, WP-565, WP-567, WP-569)
Cordless Select (WF-10W010, WF-10W012)
Cordless Plus (WP-450, WP-462, WP-463, WP-465, WP-468)
Cordless Freedom (WF-03CD010, WF-03CD012)
Cordless (WP-360)
Cordless Express (WF-02W010, WF-02W012)
Cordless Professional (WP-440)
For Kids (WP-260)
Nano (WP-310)
Nano Plus (WP-320)
Ortho Care (WP-940)
Radiance (WF-09CD010-1)
Traveler (WP-300)
Ultra (WP-100, WP-112, WP-113, WP-115, WP-117, WP-118, WP-140)
Ultra Plus (WP-150)
Not Compatible Models:
Classic Water Flosser (WP-60/65/72)
Whitening (WF-05, WF-06)
Sidekick (WF-04)