Combine hoses and create a tight seal with this threaded union. It is an essential accessory to elevate your pool maintenance. It holds tight and provides long-lasting support. "A" side is female/socket "B" side is male/threaded Comes with an o-ring to create a leak-resistant seal Overall dimensions: 3.75"H x 3.25"W x 3.25"D Outer female diameter: 2.5" Inner female diameter: 1.875" Outer male diameter: 1.8125" Inner male diameter: 1.5"