The topic is about the Salts Stoma Collar, a special sealing washer designed to fit snugly around a stoma. Its purpose is to direct output away from the base of the stoma, helping to prevent leaks. Choosing the right size is crucial for a leak-free experience. Here are some helpful tips and insights:

1. The collar has a soft rim that helps prevent leaks when the correct size is used. For example, a stoma measuring 29 mm would use the Salts part number DC29.

2. To ensure a proper fit, measure the exact diameter of your stoma and order the corresponding size. Salts offers samples upon request, which can be a great way to try before you buy.

3. If your stoma is irregularly shaped or oval, applying a thin layer of paste on the back of the collar can help fill any gaps before fitting the collar.

4. Many users find that the collar reduces or even eliminates the need for additional paste or putty rings, which can simplify the process.

5. The material of the collar is soft and not restrictive, but it's important to check that output cannot sneak behind the seal.

6. For those with non-circular stomas, some adjustments might be necessary, such as molding the collar with paste, to ensure a good fit.

7. Overall, Salts Healthcare is known for producing reliable products, and trying a sample of the collar before making a purchase is generally recommended.