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Special, hard-to-find PVC fittings for the construction of floating cages, framework, etc. Use inner caps to seal off air-filled sections from water-filled sections. Available in 1/2", 1", 11/4" and 11/2" sizes. Three-way, 4-way and 5-way cross compatible with standard Schedule 40 PVC and Schedule 160 PVC. Inner caps compatible with Schedule 40 PVC pipe and all fittings. Head of cap fits inside fittings. Skirt of cap fits inside Schedule 40 pipe. UV-resistant. Made in USA.