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Are The Seal AP 018-312 And 018-341 Compatible?
Yes, these two RV seals are compatible. The D Seal (018-312) connects to the EK series seal base (018-341) Click Here To View: AP Products Black EK Slide-Out Seal Base With 2" Wiper
The AP Products 018-184-EKD White D Seal looks to be somewhat rigid? Does it ship via freight truck or does it ship ground?
The AP Products 018-184-EKD is very flexible and comes in a roll about 2' in diameter and ships via ground. Depending on the warehouse it ships from it be either Fed EX or UPS. Click Here To View: AP
The rubber gasket on my RV slide out is similar to the 018-855 and is coming off. Would this be a good replacement or do you recommend something else?
Unfortunately, every manufacture has a different setup so the questions is difficult to answer. But by matching what you have to a replacement seal per the dimensions should lead you to the right repl