List<flow_test__c> tmplist = new List<flow_test__c>{
    new flow_test__c(Name = 'zero1', Pressure__c = 0, Flow__c = 0, Aperture__c = '1-1/4'),
    new flow_test__c(Name = 'zero2', Pressure__c = 0, Flow__c = 0, Aperture__c = '1-1/2'),
    new flow_test__c(Name = 'zero3', Pressure__c = 0, Flow__c = 0, Aperture__c = '1-3/4'),
    new flow_test__c(Name = 'zero4', Pressure__c = 0, Flow__c = 0, Aperture__c = '2'),
    new flow_test__c(Name = 'zero5', Pressure__c = 0, Flow__c = 0, Aperture__c = '2-1/4'),
    new flow_test__c(Name = 'zero6', Pressure__c = 0, Flow__c = 0, Aperture__c = '2-1/2'),
    new flow_test__c(Name = 'zero7', Pressure__c = 0, Flow__c = 0, Aperture__c = '1')
};
insert tmplist;