The GRACO 189660 is a bearing nut designed for use in Twistork siphon assemblies. It is typically constructed from acetal, though an optional Rulon® version is available for enhanced compatibility with certain chemicals. Its primary function is to help prevent excessive fluid flow between the siphon tube and helix tube in GRACO agitator systems, though it is not intended to be a complete seal.

Key Features:

• Bearing nut
• Acetal (standard), Rulon® (optional)
• Not compatible with some solvents used in paints/coatings or acidic fluids (standard acetal version); check material compatibility before use
• Helps prevent excessive fluid flow between siphon and helix tubes
• Optional Rulon® version for improved chemical resistance
• Ease of maintenance and replacement

Applications:
Used in GRACO Twistork siphon assemblies, primarily within agitator systems for fluid handling and mixing applications.

Installation Notes:

• Using genuine GRACO parts ensures proper fit, function, and compatibility with GRACO equipment, reducing the risk of equipment failure or material incompatibility.
• Apply PTFE spray lubricant to the inside lip of the bearing nut before installation
• Tighten the bearing nut onto the helix tube, torquing oppositely and evenly to 60–70 in-lbs (6.8–7.9 N•m)
• After mixing or pumping catalyzed materials, always remove the siphon tube and clean both tubes to prevent material buildup
• Check material compatibility before installation, especially if using the standard acetal version