Description
Product
Protect your boat’s pass-thru hole for wiring and cables. With Sea Dog Split 4-1/8″ Nylon Motor Cable Boot (521663-1), Split Motor Well Boot organizes and protects engine control cables and wires. It keeps the water out and improves the aesthetic of any rigging work! It comes with a cable tie and a mounting ring. Boots and rings are pre-cut to facilitate installation without the need to remove wires. Purchasing from Sea Dog ensures both dependability and performance. Key Features:
- UV-resistant molded rubber.
- Seal in the shape of an accordion.
- Made from high-quality materials
- Quick and simple installation
- Constructed to meet your precise specifications
- Completes and protects the wire and cable pass-through hole
- UV-stabilized molded rubber construction with injection-molded nylon rings
Specifications:
- Brand: Sea-Dog Marine
- SKU: 3-521663-1
- UPC: 035514522281
- Weight: 0.12 LBS
- Fastener: 8 RH
- Manufacturer Part Number (MPN): 521663-1
- A: 4-1/8″
- B: 1/2″
- Material: Nylon
Molded Rubber/Injection Molded Nylon. Split Motor Well Boot. Black accordion-style seal. Includes cable tie and mounting ring.
This product replaces:
- 521663, 521663-1, 3-521663, 35514522281


![Ancor 24-22 Gauge Heat Shrink Step-Down Multi-Wire Connectors – 25-Pack[320025]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/ancor-24-22-gauge-heat-shrink-step-down-multi-wire-connectors-25-pack-320025.webp)
![Blue Sea 7542 C-Series Flat Rocker Circuit Breaker – Single Pole – 15A [7542]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/blue-sea-7542-c-series-flat-rocker-circuit-breaker-single-pole-15a-7542.webp)
![Presta PACE Heavy Cut Compound – 32oz [133132]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/presta-pace-heavy-cut-compound-32oz-133132.webp)

![Shadow-Caster Accent Lighting Flex Strip 8′ Terminated w/20′ of Lead Wire[SCM-AL-LED-8]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/shadow-caster-accent-lighting-flex-strip-8-terminated-w-20-lead-wire-scm-al-led-.webp)
![Blue Sea 1455 4 Position Switch CLB Square[1455]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/blue-sea-1455-4-position-switch-clb-square-1455.webp)
![Shadow-Caster Courtesy Light w/2′ Lead Wire – 316 SS Cover – Great White – 4-Pack[SCM-CL-GW-SS-4PACK]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/shadow-caster-courtesy-light-w-2-lead-wire-316-ss-cover-great-white-4-pack-scm-c.webp)
![Sudbury Elastomeric Marine Sealant – 10oz Cartridge – White [300]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/sudbury-elastomeric-marine-sealant-10oz-cartridge-white-300.webp)