a novel insulated watering system for fowl , poultry , animals or the like constructed in accordance with this invention is fully illustrated in fig1 of the drawings , and is generally designated by the reference numeral 10 . the insulated watering system 10 is associated with a plurality of side - by - side wire cages which are singularly and collectively designated by the reference character c . each cage c is formed of a plurality of wires w which set - off opposite parallel end walls ( unnumbered ), opposite parallel side walls ( unnumbered ) which are normal to the end walls , a bottom wall ( not shown ) and a top wall t . the top wall t is defined or set - off by a plurality of longitudinal extending generally parallel wires wl and intersecting transverse wires wt , with adjacent pairs of the latter being spaced a predetermined distance d from each other , as is specifically illustrated in fig2 with the distance between two spaced transverse wires wt1 and wt2 being designated by the reference character d . the distance d is , of course , the same between all adjacent transverse wires wt . resting atop the top t of the cage ( s ) c are a plurality of tubular water pipes 20 , 30 , 40 collectively defining a water line 50 . each individual tubular water pipe 20 , 30 , 40 is approximately ten feet long , and adjacent tubular water pipes 20 , 30 , 40 are connected together by a connector or coupling means 60 . the couplings 60 correspond identically to the couplings 10 disclosed in u . s . pat . no . 4 , 543 , 910 and the totality of the description thereof is herein incorporated by reference . however , it is to be specifically noted that each connector 60 is formed of polymeric / copolymeric synthetic plastic material and includes an exterior cylindrical surface 61 , an interior cylindrical surface 62 , and a radially inwardly directed flange 63 which functions as an abutment for the various tubular watering pipes 20 , 30 , 40 , as is readily apparent in fig3 and 4 of the drawings . the radially inward projection of the flange 63 of each connector 61 is less than the inside diameter of any of the tubular watering pipes 20 , 30 , 40 , which is best illustrated in fig3 of the drawings . a plurality of suitable clips , such as spring clips sc having looped ends ( unnumbered ) are utilized to hold the pipes 20 , 30 , 40 atop the top t of the various cages c , again in the manner further illustrated and described in u . s . pat . no . 4 , 543 , 912 . a valve v ( fig1 ) can be opened / closed / adjusted to deliver an appropriate flow of water from the source not shown ) which would be generally located to the left in fig1 from an upstream end portion through the upstream - most pipes 20 and continuing through the pipes 30 toward and through the last of the downstream - most pipes 40 and through a series of identical nipples / drinkers 15 located along the length of the tubular pipes 20 , 30 , 40 of the watering line 60 . each nipple or drinker 15 corresponds in structure and operation to the nipple / drinker 20 disclosed in u . s . patent application ser . no . 07 / 866 , 639 , and the totality of the description thereof is herein incorporated by reference . however , it need but be noted that water will pass from the watering line 50 through any of the drinkers 15 due to movement imparted to a pin 16 by a bird or an animal which in turn unseats a ball valve or ball ( not shown ) within each drinker 15 causing water to flow into the beak / mouth of an associated bird / animal . reference is specifically made to fig3 and 4 of the drawings in which the tubular watering pipes 20 , 30 , 40 are illustrated as included respective cylindrical walls 21 , 31 , 41 . the walls 21 are each defined by an inner core 22 , and inner ply 23 having an interior surface 24 and an outer ply 25 having an exterior surface 26 . similarly , each of the tubular pipes 30 is defined by an inner core 32 , an inner ply 33 having an interior cylindrical surface 34 and an exterior ply 35 having an exterior cylindrical surface 36 . each of the tubular pipes 40 includes an inner core 42 , an interior ply 43 having an interior cylindrical surface 44 and an exterior ply 45 having an exterior cylindrical surface 46 . each of the watering pipes 20 , 30 , 40 is formed from polymeric / copolymeric plastic material , such as polyvinylchloride ( pvc ) which is blown in a conventional manner to form closed cells entrapping air / gas or an admixture thereof as the center cores 22 , 32 , 42 having exceptionally high insulation properties , whereas the plies 23 , 25 , 33 , 35 , 43 , 45 are impervious solid skins or membranes . the skins or membranes 23 , 25 , 33 , 35 , 43 , 45 are each generally of an identical thickness , namely , normally 0 . 030 inch . however , the closed cell cores 22 , 32 , 43 of the respective watering pipes 20 , 30 , 40 vary in thickness with the core 22 being the thinnest , the core 32 being of an intermediate thickness , and the core 42 being the thickest of the cores 22 , 32 , 43 . the exterior diameters of the exterior surfaces 26 , 36 , 46 of the respective pipes 20 , 30 , 40 is the same , namely , nominally 1 . 050 inch which corresponds generally to the interior diameter of the interior cylindrical surface 62 of each connector 60 which allows one size connector 60 to be bonded / fused to any of the pipes 20 , 30 , 40 . the interior cylindrical surface 24 , 34 , 44 of the respective pipes 20 , 30 , 40 have respective nominal diameter of 0 . 750 inch , 0 . 640 inch and 0 . 480 inch . due to the latter construction , all of the watering pipes 20 of the totality of the group of watering pipes 20 adjacent the valve v and thus most adjacent the water source ( not shown ) are the least insulated because of the lesser wall thickness and particularly the lesser thickness of the closed cell core 22 as , for example , compared to the next greater wall thickness and closed cell core thickness of the watering pipes 30 followed by the final group of tubular watering pipes 40 having the maximum wall thickness and the maximum thickness of the closed cell core 42 . thus , minimum insulation is most adjacent the source of the water , whereas maximum insulation is remote therefrom . furthermore , the diameter of the group of water pipes 20 is maximum at the water source , lessens through the group of water pipes 30 and is least at downstream - most points defined by the pipes 40 . hence , the volume of water is greatest flowing through the watering pipes 20 and least flowing through the water pipes 40 , although the speed is inverse thereto . due to this construction , as the water travels along the length of the watering pipe 50 from the source , as it is being depleted through the various drinkers 15 therealong , the water is progressively subject to progressively greater insulation in the direction of water flow which , of course , offsets the time the water is subject to ambient external temperatures to thereby effectively decrease / lessen the thermal differential between the temperature of the water at the source and at a point most remote therefrom . obviously , the water most adjacent the source is coolest and because its volume is greatest , due to the large diameter of the watering pipes 20 , the water temperature will be least effected by ambient temperature , particularly because much of the water is being depleted by the fowl / birds as it travels through the first group of watering pipes 20 . thus , for perhaps 100 feet of the plurality of watering pipes 20 the minimum insulation afforded the cores 22 thereof is quite adequate to prevent detrimental water temperature increase . as the water proceeds further through the next group of watering pipes 30 , assuming for another 100 feet , the increased insulation because of the thicker cores 32 affords additional protection and likewise precludes excessive water temperature increase as , of course , the water volume reduces as the diameter decreases and , of course , more water is dispensed through the nipples 15 along the watering pipes 30 . obviously , as the remaining water enters and flows through the last group of watering pipes 40 , assumed to be of another 100 foot length , maximum insulation is effected by the greatest wall thickness of the cores 42 of the watering pipes 40 . thus , in this fashion the relatively large wall thickness and the increase thereof away from the source in the direction of water flow insulates the lesser volume of water flowing through the water line along downstream portions thereof assuring minimum water temperature increase anywhere along the watering line 50 due to ambient temperature thereby decreasing the earlier mentioned disadvantages of increased bacteria and high poultry / bird mortality . although a preferred embodiment of the invention has been specifically illustrated and described herein , it is to be understood that minor variations may be made in the apparatus without departing from the spirit and scope of the invention , as defined the appended claims .