Body Glass Caddis Pupa Green
This fly has been in my boxes for a number of years and uses a unique material called Hends Body Glass. 

Tied on a Fasna Competition F800 Barbless hook with tungsten beads. 

When caddis are present, and you need an anchor nymph- there are few better options. 

Discount on Euro Nymphs

5% off 3 flies
10% off 6 flies
15% off 12 flies