Waterway 1.5 HP Executive Spa Pump Wet End [2" MBT X 2" MBT] [48 Frame] (310 1880) lighting The adjustable design also gives The adjustable design also gives professionals more flexibility when tuning the system for the needs of the installation instead of relying on a one setting only approach The Raypak R335 tube bundle is designed for compatible heater applications where the supported heat transfer assembly needs replacement The Waterway 310 1880 wet end is designed for compatible 1 this Waterway wet end is a practical replacement when the complete 48 frame wet side assembly with 2 inch MBT x 2 inch MBT connections needs renewal