This requirement is for NSWCPD and being solicited only to D40 Equipment Services MAC holders (N6449824D4013-4023). This Task Order requirement will provide services for the Sonar Dome Pressurization ... This requirement is for NSWCPD and being solicited only to D40 Equipment Services MAC holders (N6449824D4013-4023). This Task Order requirement will provide services for the Sonar Dome Pressurization System (SPDS).