Pollution Measurement Corporation Price List: 

[Not up to date for current date:  some bags in Teflon(tm)

no longer available.]

Bag Prices: OUT OF DATE

Note that PMC now has available a valve for bags as similar, but not the same, as the SKC (a competitor) 2N1 valve which is made of polypropylene.  Pricing is the same as for the metal 30-AL type valve, which adds $1 to above prices as of June, 2015.  The metal valve is generally the Dai metal valve with evacuation cross in the bottom.  Other metal valves may be used, if available and desired by the customer.