Oil drain hose kit thread size and pitch

[Two Yutes]

I have a early 90s mercruiser 5.7L and would like to install an oil drain hose kit but they offer 3 different thread sized and pitch. The part # of my oil drain bolt is 49956. Would anyone know the size and pitch off hand? Thanks

 

[alldodge]

It should be 1/2-20, see post 6
https://www.offshoreonly.com/forums...l-drain-plug-size-1995-mercruser-454-mag.html

 

[Two Yutes]

It should be 1/2-20, see post 6
https://www.offshoreonly.com/forums...l-drain-plug-size-1995-mercruser-454-mag.html

Mine is 88-90 and the only options I’m seeing on overtons is 12mmx1.75, 14mmx1.5, & 3/8x18

 

[alldodge]

While the OSO post was for a different year and size motor, it was for the same part number 49956
Searching for 49956 at BAM it comes up with many motors, even for the newest 3.0 CAT MPI. Scan thru the list and I see 5.7 for your years.

https://www.mercruiserparts.com/49956-screw

 

[jakwi]

My 5.7l had the 1/2 20 size for the drain plug, I installed a fumoto 101N valve. Works great, and makes oil changes tremendously more easy.