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"uxcell A14031900ux0663 Gel Splice UR Connector 3 Port Wire Connectors Red Clear (Pack of 55)"

uxcell A14031900ux0663 Gel Splice UR Connector 3 Port Wire Connectors Red Clear (Pack of 55)
uxcell A14031900ux0663 Gel Splice UR Connector 3 Port Wire Connectors Red Clear (Pack of 55)

Product Name : UR Connector;Model : K3

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1 comment of this product found across Reddit:
ggpwnkthx /r/networking
-19 points
1970-01-19 14:04:38.327 +0000 UTC

Or, if there's not enough room for a keystone, use push-in splicers like these: https://www.amazon.com/dp/B016FC8UNU

Although, I feel like this should really be your "all else failed" option.