Yanmar 3YM30 Calorifier Hose Size

[Stingo]

I need to replace the hoses that go from my 3YM30 to the calorifier. The current hose O/D is 20mm. I am hoping that someone on here may know the required I/D so that I can avoid removing the existing hose to measure it?

TIA

 

[charles_reed]

I need to replace the hoses that go from my 3YM30 to the calorifier. The current hose O/D is 20mm. I am hoping that someone on here may know the required I/D so that I can avoid removing the existing hose to measure it?

TIA

My 3YM20 uses 12.7mm id - presumably 1/2"