Replacement unionwith push in fittings for undersink water filtration system, home reverse osmosis water treatment. Choice of tube sizes. Fits most ro systems. 

Union with push in fittings

Select - tube size

Union 1/4" tube x 1/4" tube
Reducing union 3/8" tube x 1/4" tube  
Union 1/4" pipe thread x 1/4" pipe thread
Union 3/8" tube x 3/8" tube
Union 3/8" tube x 3/8" male compression threaded
Check Valve Union 3/8" tube x 3/8" tube

Note: These parts fit most reverse osmosis systems. If you have questions, please call us at 1-877-693-7873.