charlz, a larger cap than the pipe will automaticly let air out of your #2 pipe w/o blowing it off fwtw.
I use an old septic on my property when I cant find a dump station when I pull out of a camp spot and/or it didn't develop a leak on side of a dirt road somewhere along the way home.
I just lay the hose into it and let er rip no fancy hook up just open the lid plenty of air space its handy to have a water hose right there too. Btw dump black then gray in case they didnt mention that?
Steve
	
		
			
		
		
	
				
			I use an old septic on my property when I cant find a dump station when I pull out of a camp spot and/or it didn't develop a leak on side of a dirt road somewhere along the way home.
I just lay the hose into it and let er rip no fancy hook up just open the lid plenty of air space its handy to have a water hose right there too. Btw dump black then gray in case they didnt mention that?
Steve
			
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