PD Series Nipples (diagnostic test port connectors) up to 6,000 PSI, connect with PD Series Couplers. These push to connect Quick couplings provide easy connection for mechanical gauges or specialized diagnostic equipment including SensoControl meters and accessories. Couplers and Nipples are available in 1/8 inch size with a rated pressure of 6,000 PSI. PD Nipples meet or exceed SAE J1502 / ISO 15171-1 design and performance specifications.