This 4" Bench Receptacle mounts to the underside of a flat surface for a bench style flow test apparatus with a 4.5" net opening size. It has a 2" slip coupling on the bottom for an inline connection of our FE2.0 flow element. The FR4 incorporates an innovative pressure sensing method inside the receptacle for accurate and repeatable test pressure measurements. Inline mounting of our FE2.0 flow element along with the FR4's advanced static test pressure sensing offer excellent consistancy and balance in flow rate measurement in a trim, compact package.