Need some help from someone who has replaced their black water tank, found out mine has had several repairs and leaks. My 1987 T1660 has a 21"X60"x8" LH drain tank and I think I have found a replacement that is close enough to work. My question is: Do the toilet, shower and vent pipes go into rubber seals on the tank or are they glued on which will require lots more work. We are getting ready to take a three week trip to Arizona to see the kids and grandkids so we need to have everything ready and rolling. Would greatly appreciate any info from my fellow members. Thank You.