Installations on which flexible hose is used shall satisfy the following conditions:
a) Cylinder and the appliances connected to it shall be in the same room/shed
b) Length of hose shall be kept as short as possible and should normally not exceed 2 m; and
c) Appliances connected shall be of portable type and not mounted in a fixed position.

Flexible hose shall not be extended from one room or verandah or one space to another and, therefore, shall not be passed through doors, windows, walls, partitions, ceilings, or floors. Flexible hose shall be accessible for easy inspection and shall not be connected from hole in walls, cupboards, cabinets and other obstructions.

Appliances which are rigidly fixed in position shall be connected by means of rigid piping.

Appliances which are portable, if connected to rigid piping, shall be connected through flexible or semi flexible connections.

The hose used for connecting the cylinders with manifold as well as at any part of the piping which is subjected to full cylinder pressure shall be conforming to IS 9573 (Part 1). The free nut at the end of pig tail shall be of non-corrosive metal.

If an adaptor is used to connect the pigtails to the cylinder valves (self-closing) of the LPG cylinders, then it shall have non-return valve (NRV).