In this order –

ferrule means a metal or plastic ring designed to assist in achieving a water tight seal for a hot water bottle;

filling aperture means the opening in the neck block of a hot water bottle through which water may enter;

hot water bottle means a container that –

(a) is made from PVC or rubber; and

(b) is designed to be –

(i) completely or partly filled with hot water; and

(ii) sealed with a stopper; and

(iii) used for the purpose of warming parts of the body or a bed; and

(c) includes –

(i) a ferrule; and

(ii) a filling aperture; and

(iii) a neck block; and

(iv) a stopper;

neck block means the top of a hot water bottle when the hot water bottle is being filled;

PVC means polyvinyl chloride;

stopper means a device that is designed to be inserted into the neck block of a hot water bottle to trap water in the body of the hot water bottle.