GROCO Non-Metallic Strainer Cap Fits ARG-1500 Larger [ARG-1501-PC]Replacement plastic cap for GROCO ARG 1500 series and larger 1 1 2 inch raw water strainers. Non metallic construction provides clear view of the strainer basket interior. Does not include O rings, which are ordered separately. Non metallic plastic material allows magnification of internal viewing for easy inspection of strainer contents. Designed to fit ARG 1500 series and larger raw water strainers with 1 1 2 inch NPT threaded ports. O rings (part