(a) “Appurtenance” means an accessory or adjunct to a gas appliance intended to be used in connection with it.
(b) “Gas appliance” means a fixture or apparatus manufactured and designed to use natural, manufactured, or mixed gas as a fuel medium for developing light, heat, or power.
(c) “Appliance accessory” means a unit designed to be attached to a gas appliance, such as pilot lights, regulators, safety devices, control valves and relief valves.
(d) “House gas pipes” means gas pipes and fittings installed on any premises or in any building or other structure on the outlet side of the gas meter, or extending from gas pipes anywhere beyond that location, and ending at capped or plugged outlets ready to connect with gas fixtures or gas appliances; but shall not include the connection of the gas fixtures, gas appliances, or gas meters, or any portion of the gas service piping from street mains.
(e) “Rated input” means that maximum amount of gas expressed in BTU per hour which a gas appliance is designed to burn completely, and which is marked on any appliance meeting the requirements and specifications of the American Gas Association or other similar recognized agency.
(f) “Tubing, flexible” means a conduit to convey gas which depends for gas tightness on joint packing or on wall structure other than solid metal.
(g) “Tubing, semi-rigid” is a metallic conduit sufficiently flexible to permit bending so as to eliminate the use of elbows, generally connected to the appliance and house gas piping by means of flare or compression couplings.