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Zurn Wilkins 34-350 3/4" 350 Double Check Backflow Preventer $164.47 from $154.66	Zurn Wilkins 1-350XL 1" 350XL Double Check Backflow Preventer $216.76 from $215.18
Zurn Wilkins 1-350 1" 350 Double Check Backflow Preventer $238.61 from $226.53	Zurn Wilkins 34UFX34F-700XL 700XL Dual Check Valve with 3/4" Female Union Inlet x 3/4" Male Outlet $63.48 from $30.05
Febco 0683039 Valve Quarter Turn Shutoff, 3/4" LF850-QT Double Check Backflow from $231.99	#8 Double Window Security Check Envelopes, No.8 Double Window Bussiness Envelopes Designed for QuickBooks Checks - Computer Printed Checks - 3 5/8 X 8 11/16 (NOT for INVOICES) - 24 LB - 500 PACK $25.99 from $17.54
Double-Check for Sleeping Children: Stories from $18.95	#9 Ready-Seal Double Window Security Tinted Check Envelopes, Compatible for QuickBooks Checks, Sage 100 program, Blackbaud Software ETC, from NextDayLabels, Box of 500 from $54.99
Double Check $4.78 from $3.99	500#8 Self Seal Double Window Security Envelopes Designed for QuickBooks Checks - Computer Printed Checks - 3 5/8 X 8 11/16 (Not for Invoices) $28.99 from $24.29