Trench and all Pipes connected or communicating therewith and all the Screws Joints, Inlets, and Apertures therein respectively, air-tight, and in every respect prevent the Gas from escaping therefrom, upon pain of forfeiting for every Offence the Sum of Five Pounds. XII. And be it further enacted, That in case any Pipe, Cock, or Branch shall in pursuance of the Powers herein contained be carried or laid from any Main or Pipe belonging to the said Trustees, or to any Gas Light Company, or other Person or Persons contracting to light or lighting with Gas the said Square or any other Place within the Limits or Jurisdiction of this Act, into, through, or against any private Dwelling House, Building, Yard, or Ground, for any Purpose whatsoever, and the Owner or Occupier of any such private Dwelling House, Building, Yard, or Ground shall be desirous that the same Pipe, Cock or Branch, shall be altered or removed and taken away, and of such Desire shall give Notice in Writing to the said Trustees, or to such Gas Light Company, or other Person or Persons so contracting to light or lighting with Gas as aforesaid, then and in every such Case the said Trustees, or such Gas Light Company, or other Person or Persons so contracting to light or lighting with Gas as aforesaid, shall within Seven Days next after the Service of such Notice at the usual Office or Place of transacting Business of the said Trustees, Gas Light Company, or other such Person or Persons as aforesaid respectively, alter or remove and take away, or cause to be altered or removed and taken away, all or any such Pipes, Cocks, and Branches respectively, and in default thereof it shall be lawful for such Owner or Occupier, or any Person or Persons acting under the Authority of such Owner or Occupier, to cause such Pipes and Branches respectively to be altered or removed and taken away, as the Case may require; and all the Costs and Expences of and incident to every such Alteration or Removal shall be paid by the said Trustees, or by such Gas Light Company, or other Person or Persons contracting to light or lighting with Gas as aforesaid, and may be recovered in the same Manner as any Penalty or Forfeiture which shall be incurred under the Provisions contained in this Act may be levied or recovered, before a Justice of the Peace.