Pentair Triton II 6" MBT Black Tank Lid Kit (154641Z) magicplastics Dark gray self-aligning slip venturi

Dark gray self-aligning slip venturi inlet fitting from Infusion Pool Products

or no longer connecting securely

Genuine Hayward part IDLIVT1250

A diffuser like this is useful because it helps stabilize and direct water flow around the impeller area

This part is especially useful when troubleshooting a 3900 that moves poorly

Pentair Triton II 6" MBT Black Tank Lid Kit (154641Z) magicplastics Dark gray self-aligning slip venturiThis black 6 inch MBT tank lid kit is a replacement access lid for compatible Pentair Triton II sand filters. It helps secure the filter opening after service and supports proper pressure containment during operation. If the existing lid is warped, cracked, stripped, or difficult to remove and reinstall, replacing it can improve serviceability while helping prevent leaks around the tank access point. The kit is intended for models that use the 6 inch