Always breathe; never hold your breath, the most important rule in scuba diving. The equipment allowing us to follow this rule is often neglected when it comes to proper care and maintenance. Chatting with Sam Johnson, a full-time repair tech on the island of Hawaii, I get a chance to hear his perspective and insight when it comes to this side of the industry. Common problems, unsafe practices, nuances of servicing different brands, a detailed approach to servicing, and much more. Please enjoy.