Supplied by OmniSwivel International, this Y-block provides the ability to split a single low pressure supply line to service three devices such as BC, drysuit, and second stage regulator. Comes standard configured three 3/8-inch female ports and a 9/16-inch female port. Install a 9/16-inch male to 3/8-inch female adapter for use with a 3/8-inch M-M low pressure hose. Install a 9/16-inch male-male union for use with a standard low pressure hose with the typical 9/16-inch female fitting.