compatibility

Hi all, My supplier sent me DO8EZ magnetic door sensors instead of DO8EZS that I had ordered as expansion for my Galaxy G2-44+ with RF C079-2 portal. It appears that DO8EZS have gone out of stock. I have found documentation that DO8EZ is not compatible with G2-44+ and indeed they were not...

Tonight the arm of the ballcock feeding the cold water storage cistern in my attic broke (quite puzzling: maybe due to strong wind causing some turbulence??). Anyway, I need to replace it. I know it's faster to replace only the part inside the tank, undoing the very last compression nut. But...

Are ceramic metal halide lamps interchangeable with non ceramic metal halide lamps or do the ceramic ones need different control gear? I am thinking of getting this light fixture: http://www.toolstation.com/shop/p27660?table=no and this bulb to go with it...

Hi, I am in the process of installing a Swann cctv system to my house, the model no is DVR84550, I will need to purchase some additional cameras and was looking at the dome kit SWPRO-736PK2 £99 and SWPRO-H855PK2 1080p HD Bullet £50,Both from Amazon. Could anyone confirm compatibility for me...