S.R. Smith HS002 2" O-Ring for Heat Sink - S.R. Smith helps make the swimming pool experience better for users, owners and operators with products that encourage fun, increase functionality and improve performance. Provides a number of swimming pool products that make anyone's outdoor pool life easier. They enable pool professionals to grow their build, service, repair and remodel revenue, and ensure operators can expand programming options, boost operational efficiencies and push customer satisfaction higher.