Reefer 170 return line specs

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Hello r2r. I am setting up a second hand reefer 170 and am looking to run a 3/4 tube from my pump back to the tank.

Id like to change the return line fitting to accept a 3/4 tube. Right now the fitting is a metric thread to 5/8" barb. Does anyone know the metic thread size on the hard pipe of the return?

 

[Tom Blevins]

https://www.bulkreefsupply.com/metric-to-standard-pvc-adapters.html