Ceramic and carbon parts must meet to create a spring loaded seal. No need for silicone the rubber washers make this part water tight against the plastic housing.
Spaform GC150 Seal Kit. This seal is used on the blue headed 2 speed and 1 speed pump found in Spaform Spas from around 1998 - 2002.This seal also fits the vico and ultrajet pumps from the early 90s. hayward maxflo: super 1 and 2: Jacuzzi magnum and rc-series: Marlow Argonaut: Pentair AH Series: Purex Hydropump and L-series: Sta rite Dura, Dina, max e: DJ/JS/JT series: Swim quip magnum and RC series: American products Americana and Bronze-noryl