Test Valves

Compact and lightweight

The dahl mini-ball™ Test Valve is a reliable, compact tool for air-testing piping systems. The integrated 1/4″ turn shut-off valve means you can use it with either a compressor or a snifter valve. Best of all, it’s dahl quality that you can depend on.

See All Test Valves

Test Valves

dahl mini-ball™ Test Valves are reliable, compact tools for air-testing piping systems.

Test Valves

Test Valve 521BLD-51-01L-51
1/4″ FIP x 1/2″ MIP x 1/4″ FIP
Test Valve 521BLD-51-04FL-51
1/4″ FIP x Fem Swivel Hose Long x 1/4″ FIP

Where to Buy

Find dahl valves in hundreds of wholesale and retail locations across the US and Canada.

In-Store

Online

Our belief system has always been a very simple approach: do a good job, provide quality service, and install quality materials. The successes we’ve experienced are due in no small part to the products we install. Dahl is not just a quality product, but like us, an organization that stands behind what they do.
Shane R Letts, Letts Plumbing, Concord California

“The quality of dahl valves gives us peace of mind. We’ve never seen one fail. They’re competitively priced… for my money the best value in the plumbing business. We can’t switch from dahl, because our techs would freak out if we tried to make them use anything else.”
Devin Carel, Anderson Plumbing, Heating & Air, San Diego, CA

“To me, dahl valves are perfect… priced right, easy to work with, and they never leak. Their 3-way Universal Tee is awesome, particularly under a kitchen sink. dahl makes my job easier, every day.”
Tim Paris, Paris Plumbing, Seattle, WA

“The quality of a plumbing fixture is really only as good as the valves behind it. When I discovered dahl, I knew I’d found a product line with quality that’s equal to any other install. dahl valves are solid, easy to work with and covered by a LifeTime Warranty. Who else can say that?”
Roger Peugeot, Roger the Plumber, Overland Park, KS

“To keep our journeymen happy, it’s dahl or nothing! They’re a little spoiled, because dahl valves are so easy to work with, and so reliable. We want our customers to have the very best. That’s why our trucks start the day loaded with dahl valves.”
Vince Marino and Dawn Kennell, Vince Marino Plumbing, Finksburg, MD

“The most important thing our business has is its reputation. That’s why we always recommend premium products like dahl valves. All you need to do is pick up the valve to feel superior quality. Every dahl valve we install is good for our reputation, and helps our business grow.”
Don Caughlin, My Plumber Heating & Air, Manassas, VA

We’ve used dahl for 10 years because of reliability. If a valve installed out of sight starts leaking, it could be months before it’s noticed. That’s a disaster. dahl quality is so good after 10 years we haven’t seen a leaker. We run 60 trucks, so I figure dahl has saved us thousands of dollars in callbacks we didn’t have to make. We’ll never switch.
Bill Hawes, San Diego, CA

Have never had any issues with leaks on valve or on valve body at install date or several years later. Also never seem to seize after months of not being used.
Clare Masse, Miller Plumbing and Electric, 14 Main Street, Zurich, Ontario

Test Valves

Compact and lightweight

Test Valves

Test Valve 521BLD-51-01L-51

Test Valve 521BLD-51-04FL-51

Where to Buy