NIBCO BRASTIC sprinkler head adapters are corrosion free and improve torque resistance. Large brass starter thread prevents cross-threading and removal of PTFE tape / thread sealant during assembly. Patented design allows sprinklers to seal against CPVC eliminating potential leak paths, when properly installed. Suitable for NFPA-13/13R/13D installations: Available in straight adapters, elbows and tees.