The Lower Looper (Part #20717006) is a genuine JACK original replacement part designed for JACK E4S-3 and E4S-5 series overlock machines. Manufactured to OEM specifications for precise fit and reliable performance. Equivalent Part Numbers JACK: 20717006 Compatible Machines This part fits the following industrial sewing machine models: JACK: E4S-3, E4S-5 Technical Specifications Brand JACK Part Number 20717006 Part Type Loopers Condition New – OEM Original Looking for a replacement lower looper for your JACK E4S-3 or E4S-5 overlock machine? This genuine OEM part ensures reliable performance and precise fit. Shop with confidence — all parts ship from Miami, FL. ⚠️ Compatibility Notice: Always verify your machine model and subclass number before ordering. Part numbers and compatibility are provided as a reference only. Supra Sewing is not responsible for purchases made without confirming compatibility with your specific machine. All sales on replacement parts are final.
