silica gel circle for solar water heater Type: Solar Water Heater Parts Model Number: 20,25,47,58 mm Style: silica gel circ silica ... quality and a long service life. Product attributesNamesilica gel circleFull specifications20,25,32,47,58,70mmProduct size20,25 ... mould-open hydraulic pressure injection machine Working temperature control180°C~190°CMajor pressure30~50KpaLead Time10 days or soWight 15 ...