Low water pressure bathroom sink

[John Dorsey]

This is why I love this forum. While installing valves to shut off the outdoor sink I used the shop vac to minimize water leaking on the floor. After I was done looked good and the outdoor sink was closed off. But inexplicably the bathroom sink had very low water pressure. Read an unrelated post that talked about a check valve under the sink. Looked and bingo there it was, I must have applied suction in the line and closed it. So with the bathroom Faucet off (I tried on and it didn't work) I used the shop vac on the faucet to apply reverse pressure and viola the water pressure returned.