Hi,
The directions I was able to find are somewhat vague. I did attach them below for you. As far as the low pressure/return line, do you need to replace the entire thing? It has both metal and rubber components. In most cases, the steel doesn't fail unless it is rusted.
Take a look through the directions below and let me know if they help or if you have questions.
Take care and let me know.
Joe
See pics below.
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Wednesday, August 17th, 2022 AT 9:32 PM