Tell me what this hose if for?

[Rayk]

I'm getting ready to list some spare silicone hoses for sale and am familiar with the hoses in the top row (heater valve and water pump by-pass) but, can't recall what the little 90 degree hose on the bottom is for? Can anyone refresh my memory?

 

[SFI Cutlass]

PVC valve

 

[Rayk]

PVC valve

Thanks, any idea what a fair price would be for one of them? I've got pricing on the others. You can PM me if you wish.