WHICH ONE IS CORRECT

[GBEMY]

1. REQUEST FOR. example: I request for a cup of water.

2. REQUEST. example: I request a cup of water.

Please which one is correct?

[Rover_KE]

A more helpful title would have been Request/for (Caps Lock off, please).

2 is correct. You request a cup of water, or, more informally, you ask for one.

Rover

[Tdol]

You can use for when request is a noun: I made a request for a cup of water.

[GBEMY]

Thank you both.

[Rover_KE]

GBEMY,

your thanks are appreciated, but you don't need to send them in a separate post.
We are all happy to accept a simple click on the Like button as your acknowledgement of our help.

Rover