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Hi I have taken out a old stop tap on a lead pipe and put in two couplers. After the coupler there is a old lead tee going to the kitchen sink which was working fine before. There is another stop tap above ground which supplies the rest of the house from this line.
After putting the mains back on, the pressure to the kitchen sink was extremely low while the rest of the house is fine. I then turned it off and on again and have no water coming out the kitchen sink.
As a solution I tried attaching a water pressure pump to the kitchen sink cold side and leaving the lead pipe exposed as a release point and no water comes out. The pressure seems to hold as if the potential blockage is a perfect seal.
Now I have no idea on how to fix this please help

you have put the wrong type of tap on? a gate valve not a stop cok?