As shown in the pictures, this model number NR3XL comes with a single union/coupling.34-TPKXL The versatile NR3XL pressure reducing valve is ideal for residential applications that require higher pressure ranges or frequent sediment and debris cleaning. The stainless steel screen filters out debris without buildup to protect your plumbing system and is easy to remove and clean. The cartridge design ensures easy repairs, with a corrosion-resistant polymer composite bell on top of a cast bronze body offers easy access to internals. Lowers lifetime costs by helping to conserve water; meets code and job site requirements and is ideal for irrigation, residential single and multifamily and more. For use with potable water pipes with a 3/4 in. inner diameter Cartridge-loaded design simplifies repairs Time- and labor-saving tailpiece options include threaded, PEX, copper sweat and CPVC Quality integral stainless steel strainer screen holds up over time Highly durable, threaded bell resists corrosion and provides easy access to cartridge internals ASSE Listed 1003 IAPMO Listed CSA Certified Meets the requirements of NSF/ANSI 61 Protects plumbing from excessive water pressures Inexpensive, durable and versatile - an excellent value for residential construction Compact dimensions with a short lay length to fit in tight spaces Chemical-resistant cartridge and a durable, threaded, UV-resistant bell housing Easily swap out the repair cartridge to increase the lifespan of your valve Reduces water consumption by roughly 25% when adjusting pressure from 100 psi to 50 psi, saving on water and sewer bills Meets the requirements of NSF/ANSI/CAN 61; is ASSE Listed 1003, cUPC listed, CSA certified B356, and Safe Drinking Water Act Compliant