If there is a grub screw, it would be located somewhere in the vicinity I've marked below @atul221282. I could be anywhere around the area, even on the rear.

1. Which shut of ball valve can I use to cut off the water supply before I start fixing or changing the faucet? Image is attached for the reference.

2) Water is flowing through a 10 centimeter diameter pipe, at a rate of 9 liters per second. What is the water velocity? FIRST CLICK ON WHAT YOU ARE SOLVING FOR - VELOCITY Enter 10 in the pipe diameter box and choose centimeters from its menu. Enter 9 in the in the flow rate box and choose liters per second from its menu. Click the CALCULATE button and the answer is 114.59 centimeters per second AND the answer is in 23 other different units !! 3) Water is flowing through a 2 foot diameter pipe, at a rate of 20 inches per second. What is the flow rate? FIRST CLICK ON WHAT YOU ARE SOLVING FOR - FLOW RATE Enter 2 in the pipe diameter box and choose feet from its menu. Enter 20 in the in the velocity box and choose inches per second from its menu. Click the CALCULATE button and the answer is 5.236 cubic feet per second AND the answer is in 23 other different units !! Significant Figures >>> For easy readability, numbers are displayed in a "significant figure" format so you will not see answers such as 77.3333333333333333. Numbers larger than 1,000 will be displayed in scientific notation and with the same number of significant figures specified. You may change the significant figures displayed by changing the number in the box above. Internet Explorer and most other browsers, will display the answers properly but there are a few browsers that will show no output whatsoever. If so, enter a zero in the box above. This eliminates all formatting but it is better than seeing no output at all.

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A plumber would likely undo the black nut, which is what holds the spout onto the sink. Once the nut is undone, they would pull the spout straight up and off the T-piece. Installation is the reverse. They'd push the spout back onto the T-piece and then do up the nut.

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Thanks @MitchellMc appreciate your advice. You are always very helpful and I am glad I found this amazing community forum where I can reach out to resolve things like this.

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I N S T R U C T I O N S This ultra calculator is special by allowing you to choose among a great variety of units (6 for diameter and 24 each for velocity and flow rate). Unlike other calculators, you are NOT confined to inputting diameter in inches, velocity in miles per hour, etc. making this calculator quite versatile. 1) Water is flowing at 36 inches per second and at a rate of 1.0472 cubic feet per second. What is the pipe diameter? The most important step in using this calculator is: FIRST CHOOOSE WHAT YOU ARE SOLVING FOR In this case we are solving for PIPE DIAMETER, so click on that button. Enter 36 in the velocity box and choose inches per second from its menu. Enter 1.0472 in the in the flow rate box and choose cubic feet per second from its menu. Click the CALCULATE button and you will see this equals 8 inches. AND you get to see the answer in 5 other different units !! 2) Water is flowing through a 10 centimeter diameter pipe, at a rate of 9 liters per second. What is the water velocity? FIRST CLICK ON WHAT YOU ARE SOLVING FOR - VELOCITY Enter 10 in the pipe diameter box and choose centimeters from its menu. Enter 9 in the in the flow rate box and choose liters per second from its menu. Click the CALCULATE button and the answer is 114.59 centimeters per second AND the answer is in 23 other different units !! 3) Water is flowing through a 2 foot diameter pipe, at a rate of 20 inches per second. What is the flow rate? FIRST CLICK ON WHAT YOU ARE SOLVING FOR - FLOW RATE Enter 2 in the pipe diameter box and choose feet from its menu. Enter 20 in the in the velocity box and choose inches per second from its menu. Click the CALCULATE button and the answer is 5.236 cubic feet per second AND the answer is in 23 other different units !! Significant Figures >>> For easy readability, numbers are displayed in a "significant figure" format so you will not see answers such as 77.3333333333333333. Numbers larger than 1,000 will be displayed in scientific notation and with the same number of significant figures specified. You may change the significant figures displayed by changing the number in the box above. Internet Explorer and most other browsers, will display the answers properly but there are a few browsers that will show no output whatsoever. If so, enter a zero in the box above. This eliminates all formatting but it is better than seeing no output at all.

3) Water is flowing through a 2 foot diameter pipe, at a rate of 20 inches per second. What is the flow rate? FIRST CLICK ON WHAT YOU ARE SOLVING FOR - FLOW RATE Enter 2 in the pipe diameter box and choose feet from its menu. Enter 20 in the in the velocity box and choose inches per second from its menu. Click the CALCULATE button and the answer is 5.236 cubic feet per second AND the answer is in 23 other different units !! Significant Figures >>> For easy readability, numbers are displayed in a "significant figure" format so you will not see answers such as 77.3333333333333333. Numbers larger than 1,000 will be displayed in scientific notation and with the same number of significant figures specified. You may change the significant figures displayed by changing the number in the box above. Internet Explorer and most other browsers, will display the answers properly but there are a few browsers that will show no output whatsoever. If so, enter a zero in the box above. This eliminates all formatting but it is better than seeing no output at all.

1) Water is flowing at 36 inches per second and at a rate of 1.0472 cubic feet per second. What is the pipe diameter? The most important step in using this calculator is: FIRST CHOOOSE WHAT YOU ARE SOLVING FOR In this case we are solving for PIPE DIAMETER, so click on that button. Enter 36 in the velocity box and choose inches per second from its menu. Enter 1.0472 in the in the flow rate box and choose cubic feet per second from its menu. Click the CALCULATE button and you will see this equals 8 inches. AND you get to see the answer in 5 other different units !! 2) Water is flowing through a 10 centimeter diameter pipe, at a rate of 9 liters per second. What is the water velocity? FIRST CLICK ON WHAT YOU ARE SOLVING FOR - VELOCITY Enter 10 in the pipe diameter box and choose centimeters from its menu. Enter 9 in the in the flow rate box and choose liters per second from its menu. Click the CALCULATE button and the answer is 114.59 centimeters per second AND the answer is in 23 other different units !! 3) Water is flowing through a 2 foot diameter pipe, at a rate of 20 inches per second. What is the flow rate? FIRST CLICK ON WHAT YOU ARE SOLVING FOR - FLOW RATE Enter 2 in the pipe diameter box and choose feet from its menu. Enter 20 in the in the velocity box and choose inches per second from its menu. Click the CALCULATE button and the answer is 5.236 cubic feet per second AND the answer is in 23 other different units !! Significant Figures >>> For easy readability, numbers are displayed in a "significant figure" format so you will not see answers such as 77.3333333333333333. Numbers larger than 1,000 will be displayed in scientific notation and with the same number of significant figures specified. You may change the significant figures displayed by changing the number in the box above. Internet Explorer and most other browsers, will display the answers properly but there are a few browsers that will show no output whatsoever. If so, enter a zero in the box above. This eliminates all formatting but it is better than seeing no output at all.

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Significant Figures >>> For easy readability, numbers are displayed in a "significant figure" format so you will not see answers such as 77.3333333333333333. Numbers larger than 1,000 will be displayed in scientific notation and with the same number of significant figures specified. You may change the significant figures displayed by changing the number in the box above. Internet Explorer and most other browsers, will display the answers properly but there are a few browsers that will show no output whatsoever. If so, enter a zero in the box above. This eliminates all formatting but it is better than seeing no output at all.

I just noticed the water leaking from my sink faucet inside the sink cabinet. I have found the leak and thought of fixing it and I am slow person therefore required to shut off the water supply for longer period like few hours or half of a day. Therefore I am planning to do the following two things and after two advice:

Where do I find the grubscrew? Is it located under the sink or on top of sink? I cannot find the grubscrew at the top of the sink (bottom of spout).

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It doesn't appear that you have any isolation valve installed to simply turn off the water to this sink. Unfortunately, you'd need to turn off the mains to the property. Please be advised that this is considered plumbing work, and a licensed plumber is required to undertake it.

I don't actually believe any of the plumbing work is at fault; it appears to be the sink spout that needs replacing. You can see the water dribbling over the threads on the bottom of the spout, which indicates the leak is above that point. The only point above would be a rubber O ring on a joint that connects the spout to its base. If you check the side of the spout's base, you might find a tiny little hole and inside that hole lives a grubscrew. By undoing the grubscrew with an Allen key, you should be able to pull the spout off. On the end of the spout will be a couple of rubber O rings that need replacing. Alternatively, you might like to replace the entire spout or install a whole new basin set. To replace the spout, you don't need to turn the main's water off as the taps themselves are isolating the spout.

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Significant Figures >>> For easy readability, numbers are displayed in a "significant figure" format so you will not see answers such as 77.3333333333333333. Numbers larger than 1,000 will be displayed in scientific notation and with the same number of significant figures specified. You may change the significant figures displayed by changing the number in the box above. Internet Explorer and most other browsers, will display the answers properly but there are a few browsers that will show no output whatsoever. If so, enter a zero in the box above. This eliminates all formatting but it is better than seeing no output at all.

I have attached two more pics for your reference I really cannot find the grubscrew spot. Maybe you can check and verify thanks

Image

To remove the spout, you'll need to undo the large black nut on the underside of the bench. You'll find many spouts utilise a rubber O ring; even the spout itself is attached to the plumbing work underneath with them. The spout in this kit appears not to have a rubber O ring, but you might like to have a helpful team member in-store double-check for you.

2. What is the best way to remove the faucet and which sink faucet should I buy from bunnigs? I am after the facuet which doesn't use rubber washels at all. I have attached the image for a reference.

Thanks Mitchell, appreciate your suggestion. I have managed to find the current installation design which I am attaching to this message. Please have a look and tell me how can i change the spout only. With the image help i can tell you that plastic back nut and washer is leaking but not sure how to change spout from this T  shape installation

This ultra calculator is special by allowing you to choose among a great variety of units (6 for diameter and 24 each for velocity and flow rate). Unlike other calculators, you are NOT confined to inputting diameter in inches, velocity in miles per hour, etc. making this calculator quite versatile. 1) Water is flowing at 36 inches per second and at a rate of 1.0472 cubic feet per second. What is the pipe diameter? The most important step in using this calculator is: FIRST CHOOOSE WHAT YOU ARE SOLVING FOR In this case we are solving for PIPE DIAMETER, so click on that button. Enter 36 in the velocity box and choose inches per second from its menu. Enter 1.0472 in the in the flow rate box and choose cubic feet per second from its menu. Click the CALCULATE button and you will see this equals 8 inches. AND you get to see the answer in 5 other different units !! 2) Water is flowing through a 10 centimeter diameter pipe, at a rate of 9 liters per second. What is the water velocity? FIRST CLICK ON WHAT YOU ARE SOLVING FOR - VELOCITY Enter 10 in the pipe diameter box and choose centimeters from its menu. Enter 9 in the in the flow rate box and choose liters per second from its menu. Click the CALCULATE button and the answer is 114.59 centimeters per second AND the answer is in 23 other different units !! 3) Water is flowing through a 2 foot diameter pipe, at a rate of 20 inches per second. What is the flow rate? FIRST CLICK ON WHAT YOU ARE SOLVING FOR - FLOW RATE Enter 2 in the pipe diameter box and choose feet from its menu. Enter 20 in the in the velocity box and choose inches per second from its menu. Click the CALCULATE button and the answer is 5.236 cubic feet per second AND the answer is in 23 other different units !! Significant Figures >>> For easy readability, numbers are displayed in a "significant figure" format so you will not see answers such as 77.3333333333333333. Numbers larger than 1,000 will be displayed in scientific notation and with the same number of significant figures specified. You may change the significant figures displayed by changing the number in the box above. Internet Explorer and most other browsers, will display the answers properly but there are a few browsers that will show no output whatsoever. If so, enter a zero in the box above. This eliminates all formatting but it is better than seeing no output at all.