Waste connection

[Aerobaticflyer]

Trying to get the right adapter for the waste outlet from West Marine but apparently there are different thread pitches and diameter. Would anyone know what size is on my waste connection on my 390?

Thanks.....this site has been a great source of information over the years.

 

[boatmailster]

don't know sizes but sea ray almost always uses perko waste deck plates

 

[MonacoMike]

The pump-out side is universal but the threads must match. After I paid $20 I found one that matched at Tractor Supply for $6. Go figure. MM

 

[Stray Cat]

My 300 is 1-1/2 pipe thread - 11.5 threads per inch You can also measure the od of the threads on your holding tank cap (mine measured 1-7/8 od), then count the number of threads in 1/4 inch...11.5 tpi will be right at 2-3/4 threads in 1/4 inch, or use a thread pitch gauge.

I bought a Sealand NozAll pump out adapter model 343502...I prefer to use my own adapter because the one at our marina is either lost, or someone has crossed the threads.