Field service kit for 3" and 3.5" Generation II Heavy Duty Swing-Out Valves. This service kit includes seats, o-rings and a Generation II stainless steel ball with Hydromax. Also used as a conversion kit to convert valves with composite balls to Stainless Steel balls. This kit will service all 3" and 3.5" Akron Brass Swing-Out valves including the styles 8630, 8635, 8830 & 8835.