the_nite_owl 15 #1 Posted June 27, 2014 I am looking to get an oil drain valve for my D-160 with the Onan 16HP BF series engine but do not know what the thread size may be. I searched the forum thinking someoen must have done this already but came up with nothing. Thanks. Trent Share this post Link to post Share on other sites
305 380 #2 Posted June 27, 2014 not familiar with that motor , but my guess it is pipe thread......either 1/8 or 1/4 NPT. my money is on 1/4 Share this post Link to post Share on other sites
