How do you install it to get it watertight? Looked for youtube videos - no luck!

The fitting itself is watertight. If its not, its defective. Once you push the pipe into this fitting you will feel it "pop" or "slip" into the seat where it becomes watertight. If its sitting right, you should not be able to pull this pipe out, nor should there be any leakage from it.

Can you control the speed of water flow through this valve?

I don't see why not. For my use, it's only open or closed. You would actually be controlling the amount of flow not the speed.

Does this value have or require a california proposition 65 warning for california residents? thanks!

Prop65 applies to any material, the warning is required even if a trace amount of over 1000 substances from the Prop65 list maybe present. We have the warning on our bags to comply with the requirement of the Prop65 regulation for “clear and reasonable” warning.

Does this work with 1/4 in drip irrigation tubing?

I used it with a 1/4" pex line for a fridge filter not totally sure about the irrigation line, you can try it out for a test before installing to be sure. A good sharp tubing cutter will help for a better seal and fit. Good Luck

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🚿 Twist, Lock, and Flow—Plumbing Made Effortless!

BUILT TO LAST - Durable polypropylene body with chemical resistance ensures leak-free performance behind walls.
CERTIFIED SAFE - NSF 61 & 51 certified for potable water—trusted for your home and health.
COMPACT LIGHTWEIGHT - Slim 3/8 inch OD fitting that fits discreetly in tight spaces without compromising strength.
PRO GRADE RELIABILITY - Rated for 150 PSI at 70°F, perfect for both amateur DIYers and seasoned pros.
EFFORTLESS INSTALLATION - Push-to-connect design means no tools, glue, or soldering—get it done in seconds.

The John Guest Speedfit 3/8 Inch OD Straight Shut Off Valve is a high-quality, tool-free push-to-connect plumbing fitting made from durable polypropylene with food-grade EPDM O-rings. Certified for potable water use and rated up to 150 PSI, it offers a reliable, leak-free shut-off solution ideal for behind-the-wall installations and hydronic heating systems.

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Manufacturer	Reliance Worldwide Corporation
Part number	PPSV041212WP
Item Weight	18 g
Product Dimensions	15 x 4 x 8 cm; 18 g
Item model number	PPSV041212WP
Size	3/8 in. Tube OD
Color	White
Finish	polyprolylene
Material	polyprolylene
Item Package Quantity	1
Number Of Pieces	1
Number of Handles	1
Measurement System	inch
Specification met	NSF, fda
Specific uses	Amateur, Professional
Included components	Valve
Batteries Included?	No
Batteries Required?	No

John Guest Speedfit 3/8 Inch OD Straight Shut Off Valve, Push to Connect Plastic Plumbing Fitting, PPSV041212WP

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