Cant find the right size! i need the threaded female end to be 3/8 npt and the tube end 1/4 od. can anyone help?

This may or may not help you. But all tanks that have a small threaded outlet are 1/4" if you measure it it will actually measure close to 3/8 but they call it 1/4NPT. As far as I know they do not make a tank shutoff with 3/8NPT threads

So the outlet of this valve is a 1/4" id and 3/8" od correct? So 1/4" pex will fit in the outlet as a press fit?

No. Pex is considered as the same size as copper. 1/4 pex is equal to 5/16" OD or 1/4 CTS

wjhich way does the valve point when in the on position?

When the valve is open the blue tab is pointing to the fitting on the side, when closed it is 90 degrees to the fitting.

Will this work on a pureblueh2o tank? the tank looks similar with a 1/4" thread. that system uses a compression nut which is flimsy and leak-prone.

These are classified as universal

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🔄 Twist, click, and flow—plumbing made effortlessly smart!

BUILT TO LAST - Corrosion-resistant, lead-free polypropylene ensures durability and safety for hot & cold water systems.
CERTIFIED RELIABILITY - Meets NSF 61 & NSF 51 standards—trusted quality for professional and amateur use alike.
COMPACT LIGHTWEIGHT - At just 5 grams and a sleek 3/8" x 1/4" size, it fits tight spaces without bulk.
EFFORTLESS INSTALLATION - Push-fit and twist-lock design means no tools, no hassle—get it done in seconds.
VERSATILE COMPATIBILITY - Seamlessly connects to both plastic and copper pipes, perfect for radiant heating or storage tanks.

The John Guest JG Speedfit PPSV501222WP is a compact, corrosion-free female elbow shut off valve designed for hot and cold water and radiant heating systems. Featuring a push-to-connect, twist-lock mechanism, it installs tool-free and securely connects to plastic or copper pipes. Rated for up to 150 PSI and made from lead-free polypropylene, it meets NSF 61 and NSF 51 certifications, ensuring safe, durable, and reliable performance for both professional and DIY plumbing projects.

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Manufacturer	John Guest Speedfit
Part number	PPSV501222WP
Item Weight	5 g
Product Dimensions	27.94 x 25.4 x 10.16 cm; 5 g
Item model number	PPSV501222WP
Size	3/8"
Color	White
Material	Polypropylene
Installation Method	Push-to-Connect
Item Package Quantity	1
Number Of Pieces	1
Maximum Pressure	150 Pound per Square Inch
Number of Handles	1
Measurement System	inch
Specification met	NSF 61, NSF 51
Specific uses	Amateur, Professional
Included components	Valve
Batteries Included?	No
Batteries Required?	No

John Guest JG Speedfit PPSV501222WP 3/8-Inch by 1/4-Inch NPFT Female Elbow Shut Off Valve

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