I am replacing my tank.

I checked the connections from the supply line coming into the house to the tank itself.

Everything is 1 inch.

The connection on the tank I would like to get is 1.25 inch.

Will there be a problem adapting the 1 inch connection up to a 1.25 inch connection?

If you decrease the size of a connection the pressure increases, if you increase the size of a connection the pressure decreases.

Am I correct?

So how will that affect the tank or the overall pressure of the system?

If it will cause a problem I will need to choose a tank with a 1 inch connection.

Any comments on the subject would be appreciated