Description Bottom O-Ring seal for 4323 Surge mounting adapter Seal Only as shown in main picture. For use on Surge 'C' style lids only Will only work with the bucket lid style shown in the detail image. Included in 4320 Interpuls Pulsator kit for Surge (as shown in second picture and linked below) The pulsator mounting stem is the important detail about the lid. These lids have a stainless steel check valve with a small rubber cap on the top. the original pulsators on these lids usually had a serial number starting with a "C" or "P" see detail image with orange background for illustration Same as NuPulse MZ10015NP Related Items; 4320 Kit to replace C or P pulsators 4319 Interpuls L80 4 exit pulsator only 60505 1009051 4318 Bottom O-Ring seal for 4323 Surge mounting adapter 4323 Mount for Interpuls pulsators on C style Surge bucket lids 2809061 4324 Gasket for 4323 pulsator mount 2800290 2800065 August 2023