Installation Instructions
Sizing Guide
What Size Do You Need?
The vast majority of equipment will use either a .625″ valve stem or a .453″ stem.
.625″ Stem | .453″ Stem |
---|---|
The larger .625″ stem is found in most tractors between about 35hp and 200hp. It is also the most common size of air/water valve and will replace them in fluid filled tires. Other large equipment like dump trucks, loaders, backhoes, and many heavier trailers to include many horse trailers and equipment trailers will carry a .625″ stem. | Just about everything else will carry the .453″ stem. Smaller compact tractors, just about all mowers whether ride on or zero turn, almost all ATVs, UTVs and side by sides (SxS) will run a .453″ stem. Most pull behind equipment on wheels whether it be a farm implement, a cement mixer, a wood splitter or the majority of smaller trailers like landscape and some dump trailers will use a .453″. |
Measurement Instructions
How to Manually Measure
If you aren’t certain which size to use, the easiest way to be sure is to measure the circumference (the length around the outside) of the stem you have in there now and compare against our simple chart.
Generally, you will have one of two kinds of stems in your machine. Either a rubber snap in or a metal bolt in stem. They will have different circumferences for the same size stem.
The photos above demonstrate how to wrap a string around a stem, mark it and measure the string to determine its circumference, then they will show you the measurements for each of the following types of stems. Metal or rubber .625″ and metal or rubber .453″
Stem Type | Measurement |
---|---|
.625″ Rubber | 2 3/4″ – 3″ |
.625″ Metal | 2 1/4″ |
.453″ Rubber | 2 1/4″ |
.453″ Metal | 2″ |