General   (General discussion, talk about anything.)

Yes Tommy I fully understand how and why that would work, In a bungalow situation , In those dark days, manufacturer's of central heating pumps made them all the same and did't allow for bungalows with a lower head of water, Today however they make almost everything, 'smart' ,
The pump in your Mams house was pulling air in because the tank for the heating was low and the pumps then started with a surge,, Todays smart pumps will sense the pressure and pump accordingly so's not to. pull in air, It was clever of you to suss that pipe was purposely made to do that and realize the air,