A body shower has multiple jets that spray on you as you bathe. Some jets have pulsating heads that will give you a gentle massage as you shower. Mid-priced units are the most popular as they come in a unit that mounts on the wall.
Search results for:
A gas burner has ports all around the perimeter with the largest port positioned right in front of the ignitor. If the ports are full of gunk, no gas will get to the spark.