John Guest 3/8 Inch O.D. Tube Size x 1/4 Inch NPTF Speedfit to Female Shut Off Valve, Push to Connect Plastic Plumbing Fitting, PPSV501222WP

Q: 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

Q: 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

Q: 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.

Q: 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

Product ID: 10542980

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Details

Material
Plastic
Brand
John Guest
Item dimensions L x W x H
11 x 10 x 4
Exterior Finish
Plastic
Inlet Connection Size
0.38 Inches
Inlet Connection Type
National Pipe

💧FDA & NSF certified for potable water

⚙️150 PSI max pressure

🛠️Tool-free push-to-connect

Description

🔧 Upgrade your plumbing game with leak-free confidence!

BUILT TO LAST - Crafted from durable polypropylene with food-grade EPDM O-rings for chemical resistance and longevity.
CERTIFIED SAFETY - Meets FDA, NSF 51 & 61 standards—perfect for behind-the-wall potable water applications.
EFFORTLESS INSTALLATION - Twist, push, and lock—no tools, glue, or solder needed for a flawless fit.
PRO APPROVED RELIABILITY - Trusted by professionals for leak-free, permanent connections in both hot and cold water systems.
PRESSURE READY PERFORMANCE - Handles up to 150 PSI at 70°F, ensuring reliable shut-off under demanding conditions.

The John Guest 3/8 Inch O.D. Tube x 1/4 Inch NPTF Female Shut-Off Valve is a high-performance, push-to-connect plumbing fitting made from durable polypropylene. Featuring food-grade EPDM O-rings and certified to FDA and NSF standards, it ensures safe, permanent, and leak-free connections for potable water systems. Rated for up to 150 PSI at 70°F, this valve offers tool-free installation and professional-grade reliability backed by a 25-year warranty.

Specifications

Material	Plastic
Brand	John Guest
Item dimensions L x W x H	11 x 10 x 4 inches
Exterior Finish	Plastic
Inlet Connection Size	0.38 Inches
Inlet Connection Type	National Pipe Tapered
Maximum Operating Pressure	150 Pound per Square Inch
Number of Ports	1
Outlet Connection Size	0.38 Inches
Specification Met	NSF 61, NSF 51
Valve Type	Shut-Off Valve
Global Trade Identification Number	00665626120015
Manufacturer	John Guest Speedfit
UPC	665626120015
Part Number	PPSV501222WP
Item Weight	0.176 ounces
Product Dimensions	11 x 10 x 4 inches
Item model number	PPSV501222WP
Is Discontinued By Manufacturer	No
Size	3/8 in. OD x 1/4 in. NPTF
Color	White
Installation Method	Push-to-Connect
Item Package Quantity	1
Number Of Pieces	1
Number of Handles	1
Measurement System	inch
Usage	Amateur, Professional
Included Components	Valve
Batteries Included?	No
Batteries Required?	No
Warranty Description	25 Years