Waterco Baker Hydro HRV Vertilever Bulkhead Adapter (31B0077) praherplastics Channel drain products like this Channel drain products like this are useful because they help manage drainage across a wider opening while maintaining the intended finished grate profile This part has practical value because matching the original Goldline oriented flow switch can make replacement work cleaner and help avoid uncertainty around fit or control response The 31B0077 is a practical repair part when a compatible Baker Hydro HRV or Vertilever valve needs the right bulkhead adapter to restore proper fit Useful when the original adapter is cracked or worn