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 ahead of leaks with smart shut-off tech!

COMPACT DURABLE - Lightweight plastic build with CE certification ensures reliable, long-lasting performance.
SMART AUTO SHUT OFF - Automatically halts water flow at 65% tank pressure to prevent overflow and save water.
DUAL PACK CONVENIENCE - Two valves included for multi-point installation or backup—never run dry on efficiency.
EFFORTLESS QUICK CONNECT - Snap in place with 1/4" fittings designed for seamless RO system integration.
UNIVERSAL RO COMPATIBILITY - Engineered to fit most reverse osmosis systems for hassle-free upgrades.

The DIGITEN 1/4" Automatic Shut-Off Valve features quick-connect fittings for easy installation, automatically stops water flow when tank pressure hits 65% of supply pressure, and includes two 4-way valves compatible with most reverse osmosis systems. Compact, CE-certified, and made in the USA, it’s a reliable upgrade for efficient water management.

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Material	Plastic
Brand	DIGITEN
Item dimensions L x W x H	17.8 x 8.6 x 13.2 Centimeters
Inlet Connection Size	0.25 Inches
Inlet Connection Type	Quick-Connect
Outlet Connection Type	Barb
Number of Ports	4
Outlet Connection Size	0.25 Inches
Specification Met	CE
Manufacturer	DIGITEN
Country of Origin	USA
Item model number	ROCON2-70
Product Dimensions	17.78 x 8.64 x 13.21 cm; 18.14 g
ASIN	B01MDM0T0I

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

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