Also, the fresh water tank has no drain so most owners add a T to the outlet side and run a hose and valve out the side or out the door to drain the fresh water tank. Don't use your pump to drain the tank.
ALSO, NEVER USE BLEACH IN YOUR RV WATER SYSTEM AS IT WILL DAMAGE THE SEALS IN YOUR PUMP! THE PUMP WILL NOT HOLD PRESSURE AND WILL RUN A LITTLE EVERY MINUTE OR TWO WHEN THE SEALS GET DAMAGED. BLEACH WILL HARDEN THE RUBBER SEALS AND THEY WILL LEAK! PURCHASE SPECIAL RV WATER SYSTEM SANITIZER!
The sink drain hose that you cut uses a "zero-clearance" clamp (PEX type) that just barely fits inside the hole in the wall of the camper. A regular clamp will not fit unless the hole is enlarged. Just leave the hose in place and repair it with a barbed connector.
