Tiger loop with water

[Inverness]

Can someone show me a tiger loop when a oil tank has water inside and you can see The water inside the tiger loop.:cool4:

 

[colshaws]

http://www.westwoodproducts.com/images/tigerloop_is_reliability_us.pdf

 

[Geyser]

Got no photos but you can definitely tell the difference when waters in there. Ones ive seen have kind of algae stuck to side of bowl or you can see water at bottom and oil at top. Dip tank and check.