Suction fitting back-up rings support the fitting from behind the mounting surface and help maintain a tight, secure installation. The Jacuzzi Whirlpool Bath Suction Fitting Back-Up Ring (2136000) is a replacement back-up ring for compatible Jacuzzi Whirlpool Bath suction fitting assemblies. This part may be needed when a suction fitting is being replaced, resealed, or repaired and the original back-up ring is cracked, missing, distorted, or no longer holding tension correctly. A proper back-up ring helps distribute clamping force, improves sealing reliability, and supports safe suction fitting installation. Replacement back-up ring for suction fittings Supports compatible Jacuzzi Whirlpool Bath assemblies Helps secure the fitting from behind the surface Useful during suction fitting repair or reseal work Supports proper sealing and installation strength