Where can you buy replacement cartridges?

Good wine shops carry replacement cartridges as does the Coravin website adn Amazon as well.

So, how potentially hazardous is this system actually, anything to consider that isn't immediately obvious?

There is absolutely nothing about this system and/or device. The gas (argon) is inert and just protects the wine. Inert gas doesn't react with anything. A Champagne bottle is designed to witstand a lot of pressure, but this doesn't add pressure as much as what was originally in the bottle. If you're interested, get it. It works.

Does this also work for still wines?

No - Per Coravin, this is an important safety note. The Coravin Sparkling System is designed for use with sparkling wines only. Do not use the Sparkling System on still wines. Still wines have a different bottle design and composition than the bottles used for sparkling wines. Using the Coravin Sparkling System on still wine bottles may cause the still wine bottle to break and could cause serious injury.

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Coravin Sparkling Wine Preservation System - Preserve Wine for 4 Weeks - For Champagne and Other Sparkling Wines

Coravin Sparkling Wine Preservation System - Preserve Wine for 4 Weeks - For Champagne and Other Sparkling Wines

Product ID: 388713844

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Details

Material
Injection
Colour
Black
Finish Type
Silver
Brand
Coravin
Item Weight
440 Grams
Product Dimensions
7.3L x 8.3W

⏳Pressure indicator for perfect pour

🍾Preserves bubbles up to 4 weeks

🔒Universal secure locking stopper

Description

🍾 Pop, Preserve, Pour — Sparkle Every Day!

PURE CO 2 PROTECTION - The Sparkling Feeder blankets your wine with pure CO2, preserving flavor and fizz like a pro.
SMART PRESSURE INDICATOR - Know exactly when your wine is ready to pour with an intuitive pressure gauge—never guess again.
SLEEK SOPHISTICATED DESIGN - Elevate your bar setup with a premium, ergonomic stopper that’s as stylish as it is functional.
EFFERVESCENT FRESHNESS EXTENDED - Keeps your sparkling wine crisp and bubbly for up to 4 weeks—no more wasted bottles or missed moments.
UNIVERSAL FIT ULTIMATE SECURITY - The Sparkling Stopper locks onto virtually any bottle, ensuring airtight freshness every time.

The Coravin Sparkling Wine Preservation System extends the life of your sparkling wines up to 4 weeks by securely sealing bottles with a universal stopper and infusing pure CO2 to maintain effervescence. Featuring a pressure indicator for optimal pouring and a sleek, durable design, it’s the must-have tool for wine lovers who refuse to wait for special occasions.

Specifications

Material	Injection Molded plastic, Stainless steel, Elastomers, Polyester
Colour	Black
Finish Type	Silver
Brand	Coravin
Item Weight	440 Grams
Product Dimensions	7.3L x 8.3W Centimeters
Is Customisable	No
Manufacturer	Coravin
UPC	850014752255
Number of Items	1
Item Form	handheld with cylindrical components
Recommended Uses For Product	Preserving sparkling wine
Special Feature	Dishwasher Safe
Country of Origin	Hong Kong
Item model number	Não aplicável
ASIN	B098DM6C3K