[Amazon.com] BISS: FASPARTS 1/2" NPT Female / FPT / FIP Coupler Brass Fitting Fuel / Air / Water / Boat / Gas / Oil WOG - FASPARTS

[Amazon.com] Home Improvement: Watts P-600 Quick Connect Coupling, 1/2-Inch CTS - Watts

[Amazon.com] Lawn & Patio: 5/8 x 1/2" I.D. Reducer Coupler C x C Bag of 10 Pieces - sunprts

[Amazon.com] Home Improvement: SharkBite U009LFA Reducing Coupling, 3/8-Inch by 1/2-Inch - SharkBite

[Amazon.com] BISS: FasParts Brass 1/2" Male NPT MPT MIP Close Nipple Brass Pipe Fitting Fuel / Air / Water / Boat / Gas / Oil WOG - FASPARTS

[Amazon.com] BISS: Spears P100 Series PVC DWV Pipe Fitting, Coupling, 1-1/2" Hub - Spears Manufacturing

[Amazon.com] Home Improvement: R410a 3/4 x 1/2" I.D. Reducer Coupler C x C Bag of 10 Pieces - sunprts

[Amazon.com] Home Improvement: Shark Bite 23337-0000LF 1/2 -InchX 1/4-Inch Straight Stop Fitting - Jensen

[Amazon.com] BISS: FasParts 3/4" Male NPT to 1/2" Male NPT MPT MIP Hex Pipe Nipple Brass Fitting Fuel / Air / Water / Boat / Gas / Oil WOG - FASPARTS

[Amazon.com] CE: Fosmon [Triple Speaker] Home Theater Wall Plate - Premium Quality Gold Plated Copper Banana Binding Post Coupler Type Wall Plate for 3 Speakers (White) - Fosmon Technology

[Amazon.com] BISS: Spears P103R Series PVC DWV Pipe Fitting, Adapter with Plastic Nut & Washer, 1-1/2" Spigot x 1-1/2" Slip - Spears Manufacturing

[Amazon.com] Home Improvement: 5x 3/4"PT to 1/2"PT M/F Thread Brass Hex Bushing Pipe Fitting Adapter - Amico

[Amazon.com] Home Improvement: Shark Bite U118LFA 3/8-Inch by 1/2-Inch Male NPT Push-Fit Connector - Jensen

[Amazon.com] Home Improvement: Mission Rubber 300122 CK 22 Band-Seal Specialty Coupling, 2-Inch Cast-Iron/Plastic/Steel to 2-Inch Copper - Mission Rubber

[Amazon.com] Home Improvement: Shark Bite 23336-0000LF 1/2-Inch by 1/4-Inch Angle Stop Fitting - Jensen

[Amazon.com] Home Improvement: PRIMEWELD 50A Air Inverter Plasma Cutter Dual Voltage 110/220VAC 1/2" Clean Cut - PRIMEWELD

[Amazon.com] BISS: Spears P502 Series PVC DWV Pipe Fitting, 1/8 Bend, Reducing Combination Wye, 4" x 4" x 2" Hub - Spears Manufacturing

[Amazon.com] Home Improvement: Alightings 10mm 4pin Gapless LED Strip Connector without wire for DIY Custom Cable lengths with Solderless Solid Lock Design work with 120leds/m Non-Waterproof RGB LED Strip Light(Pack of 10) - Alightings

[Amazon.com] Home Improvement: 6mm Flexible DC Motor Hex Coupling Coupler Copper for RC Model Wheels - uxcell

[Amazon.com] Home Improvement: Alightings Quick Wire Splice Connectors Without Stripping the Wires Compatible with 24 - 20 AWG Cable for Some Tight-fitting Automotive Uses(pack of 10, I Type 2pin) - Alightings

The above is "2" Copper Coupler, BISS: FASPARTS 1/2" NPT Female / FPT / FIP Coupler Brass Fitting Fuel / Air / Wa..." recommended related products, Please click on the picture to see product details and 2" copper coupler reviews!