Drain valve replacements

[Friendship14]

We have a 99 Friendship 40 ft. We have 3 low level drain valves on the passanger side. They were pull up type drains and one has broken. We have removed them along with approx. 3 inch water line leading to the elbows. I need to find a source to find replacements for these 3 pop up drains. We were told they don't crimp the lines any longer so any ideas how to hold the water lines on? I haven't had any luck finding these valves on the internet and our only RV supplier here said they haven't seen this type of drain valve in years. Any help would be appreciated!!

[abc]

I think your 99 friendship 40 ft. belongs to class A RVs. Can you tell me the capacity. If you can post a picture of the existing valve it may be helpful to find the exact match by seeing this. I would also recommend you to post the full specifications so that I can find out the make of the valve.