3010207c__Apricus_vs_Hills___ClearChain__Difference
[Hills] Plastic [Apricus] Rubber [Comment] I noticed this at a recent trade show. I do agree the plastic of the hill system will last longer. Though it’s not worth the significant cost difference. – You could even buy the boots from Hills and use them with Apricus! Apricus uses HTV Silicone Rubber because it is FAR SUPERIOR to any plastic in terms of UV resistance. It is a more expensive material choice than plastic, almost double the cost in fact. I would be interested to see a third party report showing that the plastic used by Hills will last the equivalent of 10 years UV exposure without significant loss of structural strength and function [Difference] 
Rubber Holder vs Plastic Holder for evacuated tube end
Solar Hot Water - Evacuated Tubes - Apricus vs Hills - ClearChain
Difference