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You cannot mate a RED and BLACK plug as they are made differently to avoid this. Also, the SB50 will not mate with a larger plug style such as the SB175. The plugs will only mate with their own series (SB50).
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.