Pond Boss Forums POND CONSTRUCTION Building a dam 8" siphon: static pressure at output valve?

Any 8" valve will be expensive, but the Valterra stainless slide gate valve is effective and the least expensive. I use Valterra valves in every freeze/break proof siphon system I install for clients. The air break is the only place I install a valve, so the siphon can be manually started. At the outlet, a "test plug" is used if needing to prime, and is FAR cheaper than a valve!