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http://www.lowes.com/pd_116261-15649-PPSK400_4294763912_4294937087_?productId=1005387&Ns=p_product_prd_lis_ord_nbr|0||p_product_qty_sales_dollar|1&pl=1&currentURL=%2Fpl_Pump%2BAccessories_4294763912_4294937087_%3Fpage%3D2%26Ns%3Dp_product_prd_lis_ord_nbr%7C0%7C%7Cp_product_qty_sales_dollar%7C1&fa...

There are nice butt connectors that have heat shrinking ends. You could twist, solder and seal with heat shrink tubing. Plain old butt connectors work just fine if for several years in decent environments. A good crimping tool is helpful. In you local home depot/Ace/Lowes or whatever...