Product Includes:

• (1) Union Nut
• (1) Union Tailpiece
• (1) Union O-ring

Used With:

•  Hayward Aquarite Salt Systems -AQR3CUL, AQR3XLCUL, AQR9CUL, AQR9XLCUL, AQR15CUL, AQR15XLCUL, AQR925-CUL, AQR940-CUL
• Hayward Aquarite Low Salt Systems - AQR-LS-CUL, AQRXL-LS-CUL

Might be compatible with older models as long as the part number is listed in the product manual