Raypak P-R185A to P-R405A, C-R185A to P-R405A, P-R185AL to P-R405AL, C-R185AL to C-R405AL, RP2100 Installation And Operating Instructions Manual page 2

TO WHOM IT MAY CONCERN:
The new Raypak series RP2100 pool heaters have been designed to eliminate
the need for conventional heat sinks (high temperature piping). The initial
connection to the heater is made with a 2" PVC union adapter to which PVC
may then be connected with appropriate cement.
This newly authorized piping arrangement is described in the installation
manual provided by Raypak, and has been successfully tested by Raypak to
assure its acceptability.
Larry J. Ashton, P.E.
Vice President of Engineering
and Technical Services