Does this work with the watt premier ro system?

Yep, more specifically for an watts RO pure plus system. Just installed one of these and it worked without any issues

How do i connect it to watts premier wp-5? The system gas it's own aso inside, air-gap faucet and tank line is 3/8, not 1/4?

If your supply/ return lines are 3/8ths od and the valve is 1/4 od this is probably not the valve you need, suggest you contact the manufacturer of your filter for a suitable replacement

Is there any warranty on this?

This has worked very well for me since purchase some years ago. It replaced a defective unit on my RO system. At the price point - if it died now at 4 years - I'd have no complaints. But it marches on. So just drop the hammer on it, and move on.

Have 5 stage ro, upgraded tank to 80 gallon. works fine. now added 2nd membrane and 2nd 120 gallon tank. reject water never stops. how to fix ?

It needs to be able to build pressure for it to shut off. Your tank may not be building any pressure check to make sure you don't have any leaks in the tank

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💧 Stay in control, save water, and upgrade your RO game effortlessly!

VALUE PACK - Includes two 4-way shut-off valves for dual system upgrades or backups.
DURABLE CERTIFIED - CE-certified plastic construction ensures reliable, long-lasting performance.
SMART WATER CONTROL - Automatically stops water flow when tank pressure hits 65%, preventing overflow and saving water.
COMPACT LIGHTWEIGHT - Slim 17.78 x 8.64 x 13.21 cm design weighing just 18g fits seamlessly into your system.
EFFORTLESS INSTALLATION - Top-side 'in & out' markings simplify setup for any RO system.

The DIGITEN 1/4" Automatic Shut-Off Valve with Quick-Connect Fittings is a CE-certified, easy-to-install plumbing valve designed for reverse osmosis systems. It automatically halts water flow when tank pressure reaches 65% of supply pressure, preventing overflow and optimizing system efficiency. This pack of two valves features universal compatibility, compact dimensions, and clear 'in & out' markings for hassle-free setup.

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Manufacturer	DIGITEN
Part Number	ROCON2-70
Product Dimensions	17.78 x 8.64 x 13.21 cm; 18.14 g
Item model number	ROCON2-70
Colour	2 Pack
Material	Plastic
Item Package Quantity	2
Maximum Pressure	65 Pound per Square Inch
Certification	CE
Batteries included?	No
Batteries Required?	No
Item Weight	18.1 g

DIGITEN 1/4" Automatic Shut-Off Valve with Quick-Connect Fittings for RO Reverse Osmosis(Pack of 2)

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