Prothane 19-1702 Red Polyurethane Coil Spring Insert High - 3-Ring 3-1/2

The Prothane 19-1702 is a universal polyurethane coil spring dampening insert designed to prevent suspension bottoming and add a progressive compression rate to your existing coil springs. Available in a 3-1/2" height with a 3-ring design, this insert is a direct drop-in solution that eliminates the need for stacking multiple smaller inserts.

Constructed from Prothane's specially formulated non-rebound polyurethane, these inserts not only cushion against bottoming out but also reduce rebound after compression — delivering a more controlled and confident ride under load. The red polyurethane compound is engineered for resilience, performance, and long-term durability.

Key Features:

• Prevents suspension bottoming under heavy loads
• Adds progressive compression rate to coil springs
• Specially formulated non-rebound polyurethane reduces rebound after compression
• 3-ring design — 3-1/2" installed height
• 3-3/4" outside diameter (O.D.)
• Red polyurethane construction
• Universal fit — semi-universal application
• Sold as a 2-piece kit
• Made in the USA
• Backed by Prothane's lifetime warranty against defects in materials and workmanship

Installation Notes: Dampening inserts, when installed, should be 1" to 3" less in height than the spring's installed height on Chevrolet vehicles, 3/4" to 1-1/2" less for Dodge vehicles, and 2" to 3" less for Ford vehicles. This is a semi-universal insert — verify coil spring inside diameter before installation.