Overview Reviews Similar Products Product Description Split nut union, standard 1-1/2" Aqua Flo Union nut. Measures 2 3/8" On the threads and 2 1/8" on the opening, perfect way to replace your pump union without having to replump. Product Videos Custom Field Product Reviews Find Similar Products by Category Recommended Quick view Master Spas 1-1/2" Spa Pump Union - X275200 $11.95 Add to Cart Quick view Master Spas 2" Split Pump Union Part # X804648 $14.52 $12.95 Add to Cart Quick view Master Spas 1 1/2" Pump Union O-Ring X280400 $1.50 Add to Cart