will this valve fit a 3/4" ID vinyl hose?

Yes. But it did not work and I lost about 75 gallons out of my saltwater tank when the power went out. Only took about 3 min. For half of my tank to empty.. I would find a nicer piece if i were looking.

How does this fit both 1" & 3/4" pipe? From the pictures I don't see any way to support multiple diameters.

The smooth is 3/4 the ridged is 1 inch.

Will this work to keep water from draining back into my washing machine?

I will say it does. I use it to keep water from draining in my dishwasher machine

Can this be used with a dishwasher drain hose, to prevent backflow from the garbage disposal?

Provide an easy way to maintain prime in a suction or discharge line. Suitable for use with manual or electric pumps

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🚀 Keep your flow flawless with Whale’s check valve – the silent hero of your pump system!

BUILT TO LAST - Durable Nitrile construction guarantees reliable, long-term performance under pressure.
PUMP FRIENDLY - Works seamlessly with manual and electric pumps, adapting to your setup.
VERSATILE FIT - Compatible with both 3/4” (19mm) and 1” (25mm) pipes for flexible installation.
NO MORE DRAIN BACK - Prevents unwanted backflow, keeping your system efficient and mess-free.
PRIME FLOW ALWAYS READY - Ensures your suction or discharge line stays primed for instant pumping action.

The Whale Check Valve LV1219 is a compact, durable inline valve designed for 19mm and 25mm hoses. It reliably maintains prime in suction or discharge lines, prevents drain back, and is compatible with both manual and electric pumps. Crafted from tough Nitrile material, it ensures long-lasting, efficient pumping performance.

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€ 47.07

Duties & taxes incl.

Andorrastore

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Manufacturer	whale
Part Number	LV1219
Product Dimensions	17 x 10 x 4 cm; 30 g
Batteries	1 Unknown batteries required.
Item model number	LV1219
Size	One Size
Colour	Black
Material	other
Item Package Quantity	1
Certification	CSA
Batteries included?	No
Batteries Required?	No
Item Weight	30 g

Whale check valve for 19 mm hose, 59416

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