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Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 21799
Experience:  40+ yrs. experience as a licensed oil & gas technician.
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I have a Robertshaw 7100DER-S7C gas valve that is chattering.

Resolved Question:

I have a Robertshaw 7100DER-S7C gas valve that is chattering. What is the proper replacement valve?
Submitted: 7 years ago.
Category: HVAC
Expert:  Rick replied 7 years ago.
HiCustomerbr />
There could be more than one compatible replacement. Here is one
Rick and other HVAC Specialists are ready to help you
Customer: replied 7 years ago.

My only concern is that it appears that the 7100DER-s7c has 1/2" inlet and 1/2" outlet. Do I just bush down the 3/4" outlet on the GSV720072A
Expert:  Rick replied 7 years ago.
You can bush it down to whatever size you need. These valves usually come with several flush steel bushings