Butterfly design. Housing made of stainless steel with fluoroelastomer seal. Two Buna-N rings act as rotary shaft seals. Helium leak-tested. Leak rate 1 x 10-6 mbar x l/s. Excellent throughput.
POA means "Price On Application". Items displaying POA instead of the sell price do so for a number of reasons, not least because we anticipate some additional information is required in order to supply the most suitable options/configuration to each individual customer.