An Act amending the act of July 18, 1935 (P.L.1286, No.402), entitled "An act empowering counties, cities, boroughs, incorporated towns, and townships to charge and collect from owners of and water users in property served thereby, annual rentals, rates or charges for the use of certain sewers, sewerage systems and sewage treatment works, including charges for operation, inspection, maintenance, repair, depreciation, and the amortization of indebtedness and interest thereon; empowering counties, cities, boroughs, incorporated towns and townships to contract with authorities organized by cities of the second class, by cities of the second class A, by counties or by cities of the third class for sewer, sewerage and sewage treatment services; to grant, convey, lease, transfer, encumber, mortgage and pledge to such authorities, their sewers, sewerage systems and sewage treatment works; to assign and pledge to such authorities rentals, rates and charges charged and collected by them for the use thereof, and to assign to such authorities their power to charge and collect the same; and validating all such contracts, grants, conveyances, leases, transfers, assignments, encumbrances, mortgages and pledges heretofore made," further providing for rentals for use of sewage system and for amount of rental or charge.