Sanitation strategies devised for 5/16" tubing are not entirely adequate for 3/16" tubing. The issue with 3/16" systems is a combined problem of sanitation and clogging. Therefore a new spout, a CV spout, or a Zap Bac spout alone can't solve the issue of clogging at the tees and unions.

https://mapleresearch.org/pub/1219tubing-2-2/

Cornell has found essentially the same thing. https://www.youtube.com/watch?v=wEBnFFer2UA

There are currently two approaches that are recommended.

1. Using a chemical sanitizer (bleach...typically a Calcium-based bleach to avoid attracting squirrels) and either replace spouts each year or use a steri-tip to also sanitize the spout, ensuring a contact time of 10 min or more, then rinsing or allowing the first sap to run on the ground in the spring, OR

2. Replace all tees and fittings at least every 3 yrs (to stop the clogging issue), with new spouts or CV spouts annually, or new drops (including tees) every 3 yrs with new spouts each year (to fix the spout sanitation issue).