Bulkhead 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.
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.
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.