When buying a penis pump, it's important to choose a reputable manufacturer and to purchase from a reputable retailer. Here are a few steps you can take to ensure you're buying a high-quality penis pump:

1. Research the manufacturer: Look for information about the manufacturer's history, reputation, and customer service policies.
2. Read product reviews: Check customer reviews on retailer websites and other online forums to see what other users have to say about the product.
3. Check for FDA approval: The U.S. Food and Drug Administration (FDA) regulates penis pumps and other medical devices. Look for a pump that has been FDA approved or cleared.
4. Consider the price: Penis pumps can range in price from less than $20 to several hundred dollars. While a higher price does not always indicate a better product, be wary of pumps that seem too cheap or too good to be true.
5. Choose a reputable retailer: Purchase from a well-known retailer with a good reputation for customer service and product quality.
6. Check the return policy: Make sure you can return the product if you're not satisfied or if it doesn't work for you.
7. Consider consulting a healthcare professional: If you have a medical condition or are taking medication, it's a good idea to consult a healthcare professional before using a penis pump.

Remember to use your penis pump safely and in accordance with the manufacturer's instructions. Overuse or misuse of a penis pump can cause side effects, such as bruising, pain, and numbness. Additionally, penis pumps do not address the underlying causes of erectile dysfunction and should not be used as a long-term solution without consulting a healthcare professional.