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KujectDirect via Amazon [amazon.com] has Kuject 200PCS Solder Seal Wire Connector Kit, Solder Seal Butt Waterproof Insulated Electrical Wire Splice for Automotive Marine Boat $ 7.79 +Free Shipping w/ Prime or $ 35+ on sale for $ 12.99 – $ 5.20 (40% off) w/code IOH86ZC3 = $ 7.79. Shipping is free w/ Prime.
Fit for Confined and Narrow Spaces – can be bent after connection and no need to crimp or solder in the confined area, just control the temperature via a heat gun.