Question:

natural and synthetic rubber?

which has more quality? natural rubber or synthetic rubber?

Answer:

copper will cost you a whole lot considering copper prices. CPVC is ok, and PVC is not allowed for potable water. A real good system to use is PEX pipe. I use the Zurn Pex system and have had no problems with it. It installs quicker, uses less fittings, and is way cheaper than copper.
Assuming the Employer is playing Dirty: File for unemployment. This puts the burden of proof on the employer. They might just want to avoid the case or may not feel it is very strong and respond by -no contest- thus allowing you to collect rather then having a series of appeals and hearings. You are rolling the dice a little. How strong is your case and if you wouldn't mind having the particulars of the subject public. If they decide to fight you and you feel your reputation is better served then back out of it and let it die. No harm no foul and you took a good shot at getting Unemployment. -JustThinking

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