Bulkhead Fittings
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Aquascape® Plumbing Parts - Gate Valve, Y-Valve, Conversion Kit, and FittingsAquascape® Plumbing Parts - Gate Valve, Y-Valve, Conversion Kit, and FittingsThese plumbing parts are for use with various Aquascape® or other brand name systems. Y-Valve regulates water flow from one to two independent outlets. Conversion kit connects PVC pipe of different diameters. Barbed hose tees, reducer fittings, and bulkhead fittings also available. 

Atlantic Water Gardens 3" FIPT Bulkhead FittingAtlantic Water Gardens 3" FIPT Bulkhead FittingThis 3" FPT bulkhead fitting is for use with Atlantic Water Gardens skimmers, waterfall filters and other products.
Bulkhead Fittings by Helix - Made in AmericaBulkhead Fittings by Helix - Made in AmericaBulkhead fittings are ideal when you need a watertight seal when making a penetration under water level. Use for liners, filters, skimmers and other pond components. These high quality, American-made hard plastic Bulkhead fittings are available in five sizes.
FPT Threaded Bulkhead Fittings - Create Watertight Seals below Water LevelFPT Threaded Bulkhead Fittings - Create Watertight Seals below Water Level
Bulkhead fittings are ideal when you need a watertight seal when making a penetration under water level. Use for liners, filters, skimmers and other pond components.

    Oase Tradux Bulk Head FittingOase Tradux Bulk Head Fitting

    Oase Tradux Bulk Head Fittings enable a wall transition below the water surface in order to hide cables or hoses.  Pumps, filters and lights are invisibly supplied with power and hoses; forget the bothersome attempts to conceal connections that run over the edge of the pond.

      Tangential Pond Return (TPR) and Straight Pond Return (SPR)Tangential Pond Return (TPR) and Straight Pond Return (SPR)

      These flanged connectors make your below-surface return lines to the pond an easy and professional installation. Pond returns have a much wider rim than bulkheads, making them better for use with flexible (and slightly stretchable) rubber liner.