HUB Parts › Rinser Drain Insert Image 1 of 2 Image 2 of 2 Rinser Drain Insert $3.50 Quantity: Add To Cart Added! This plastic insert ensures your rinser drain fitting tightens properly.If your rinser drain is leaking, it’s likely this insert is missing.Material and design: HDPE plastic, made in-house. This plastic insert ensures your rinser drain fitting tightens properly.If your rinser drain is leaking, it’s likely this insert is missing.Material and design: HDPE plastic, made in-house.