Hot water coming out slow

[tate16t]

The hot water from my kitchen faucet is coming out slow. I think I may have a blockage somewhere. Also, I had a leak via one 3/8 inch connector that I replaced yesterday. After replacing the connector hot water continues to drain slowly. I would like to replace the smaller cable connector in the pic below to the left. What is this connector called? Or, what other options do I have if this connector is not available at the big box stores?

The first pic shows the 3/8in connector cable I replaced.

The second pic shows the connector cable I wish to replace.

The last pic on the bottom shows a small drip leak at the shutoff valve where the 3/8 connector cable attaches.

 

[tate16t]

I'm ok now. When I took the supply line off from the faucet I turned the water on while pointing the line in the sink. The force of gravity was on my side. Crud causing the blockage came out!