Years ago while full timing, I always had issues with connecting my sewer hose to the RV, as well as, between the hose and the fitting. I didn’t have an RV Cam Lock. The bayonet fitting on my RV, as it is with almost all other RVs, is a male 4 pin connection, while the hose end is a female with the seal located in it.
This arrangement seemed odd, so I began to look at how other industries transferred liquids from vehicles. 
The first thing I noticed was the connections were completely different, not just in material thickness, to take the abuse of constant usage, but also the way the industrial fittings work. Industry standard fittings are all “compression” fittings, in other words when the male fitting comes in contact with the seal, it is compressed into the seal either with 2 cams or with a threaded ring, which is used extensively on fire trucks. The 2 cam arms are used on fuel trucks, as seen below.
This difference is significant when high pressure is needed, as with fire trucks and is as important when transferring fuel, even though the fuel is not under pressure, other than what is created by the tank. The need to have a connection that insured a fail proof connection made the “compression” style fitting a standard in all industries, with the exception of the RV industry.
Human waste is by no means as harmful when spilled, as fuel or as accident prone as a pressurized fire hose connection coming loose, but human waste is considered an environmental hazard!
Further study revealed that all commercial vehicles have the female fitting on the vehicle and the male fitting on the hose, exactly opposite to the RV bayonet system. The reason the male is on the hose in commercial applications is that the male fittings are just slightly larger than the hose itself, so are easier to store and handle the hose and extension hose assemblies.
Over the past 5 years we have never had a customer say they didn’t like the Cam Loc fitting and in fact we get compliments all the time on the secure feeling the user gets while dumping the holding tanks.
To hear what others are saying about the cam loc fitting, simply google RV cam lock or click this link to see a comment from the IRV2.com forum http://www.irv2.com/forums/f52/no-leak-sewer-hose-system-76084.html
Watch the RV Doctor show you how the system works. https://youtu.be/j-mehVSn6Ws
We are always happy to talk to you directly if you have question, 877 787 8833 toll free.