will this work for Corsair Air Series SP 140 LED 3pin fan connector to tge 4-pin motherboard fan headers?

ANY standard 3-pin fan plug will properly connect to the standard 4-pin socket such as on this Y-cable. Just remember that your MB has to support the extra fan load (should be no problem) and that the 3-pin fans speed will be constant since it isn't PWM.

How well will this work for a CPU water cooling system with a 4 pin fan and 3 pin water block pump combo?

Should work fine. You can plug a 3 pin connector into 4 pin and vice versa. But, if you try running them from the pwm speed (thats what the fourth pin is), I'm not sure if it'll run the pump at full speed or at the percentage you want since it may run the voltage at 100 and modulate the speed using the pwm. If it does, just tell it to use voltage instead of pwm for speed and it should work just fine.

will this power 2 fans 1x180mm an 1x80mm without a molex connection to the psu?

It works great for 2 140s off of the motherboard header

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Coboc TX4SPL2-12 1 ft. Sleeved 12 inch 1 to Two(2) x 4-pin TX4 PWM Fan Power Splitter Cable (Net Jacket) Female to Male

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12" PWM Fan Y Cable
22AWG Tinned Copper
TX4 Female to 2x TX4 Male
Black Sleeved Jacket

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The Coboc TX4SPL2-12 splitter cable allows you to connect two PWM fans to a single pin header on your motherboard. Only one of the male connectors has the full 4-pin structure for complete PWM function. And the cable is fully sleeved, making for a clean, professional look inside your chassis.

General information

Compatible with 4-pin PMW fan connector and 3-pin fan connector
Only one of the two fans sends its tach signal (the one with full 4-pin connector) and reports its RPM, but the other one will still follow the PWM signal.
The other connector's tachometric signal pin is missing, which ensures your fan speed monitor won't bounce all over the place from getting two sense signals. This guarantees your motherboard gets an accurate RPM signal.

Brand	Coboc
Model	TX4SPL2-12
Color	Multi-Color with Black Sleeved

Connector A	1x TX4 female
Connector B	2x TX4 male
Connector Number	3
Terminal Gender	Female to Male

Coboc TX4SPL2-12 1 ft. Sleeved 12 inch 1 to Two(2) x 4-pin TX4 PWM Fan Power Splitter Cable (Net Jacket) Female to Male

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Details
Length	12"
Cable Length	1 ft.

Item#: N82E16812423161

Coboc TX4SPL2-12 1 ft. Sleeved 12 inch 1 to Two(2) x 4-pin TX4 PWM Fan Power Splitter Cable (Net Jacket) Female to Male

Learn more about the Coboc TX4SPL2-12

Customer Reviews of the Coboc TX4SPL2-12

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info