Reducing expansion noise

[Andrew Saint]

Hi
I am quite new to refrigeration design and have noticed various different manufacturers have specific ways to reduce the expansion noise made when the cap tube enters the freezer evaporator. Does anybody have any suggestions as to what they think is the best and most cost effective way to achieve the best noise reduction when joining the cap tube to the evaporator?
Thanks

[brunstar]

you could try putty as this is quite dense or a little inline reciever.

[DEVIL]

as brunstar says som putty cold solve the problem, and daikin in some applications use a lite incline receiver