I was able to diagnose and fix my pool heater myself using You Tube, basic tools and this Pressure Switch. Best price and great service, communication and delivery from Sunplay. The switch is plastic, the switch that got replaced was metal and rusty. I went with the plastic because it doesn't rust. I would have given it 5 stars, but the part got stripped by the wrench a bit while tightening it up- because it's plastic that's all. It tightened up fine, it works, my pool heater went right on, it doesn't leak.
Thank you Sunplay!