How to measure for a proper coupling fit

There are 2 ways of measuring for a proper bowl size fit. One way is using a string or a OD tape to measure the hose. Another way and most accurate is using a digital caliper to measure the inside of the bowl on the coupling.

 

Materials needed to get started:

  • Hose and / or coupling
  • Digital Calliper
  • Rope / string
  • Marker
  • OD tape
  • Measuring tape

 

Calculating a hose diameter using a string

  1. Place a lay flat hose on a flat smooth surface
  2. Wrap the string around the hose
  3. Keep the string running around the diameter straight and true
  4. Mark the string across both ends
  5. Lay out the sting next to a yard stick and tape measure
  6. Read the length of the string from mark to mark
  7. This will give you the circumference of the hose
  8. Take this length and divide by PIE: 3.1416
  9. This will give you the diameter of the hose

 

 

Calculating a hose diameter using a OD tape

  1. Wrap the OD tape around the hose
  2. Read the length of the string from mark to mark
  3. This will give you the diameter of the hose

 

Calculating the inside diameter with a digital calliper

  1. Place the inside tips of the calliper on the inside of the bowl (coupling)
  2. Expand the tips of the calliper until they're fully extended to the bowl size
  3. This will give you the correct size of the bowl needed
  4. 1.75 is equivalent to a 1 3/4 size bowl

 

 

 



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