Jun 27, 2023 #1 M mrmolasses Registered User Joined Mar 23, 2023 Posts 4 Reaction score 0 Location pa any one know the thread size so i can plug it?
Jun 28, 2023 #2 chillman88 Supporting Member Supporting Member Joined Feb 22, 2017 Posts 6,043 Reaction score 6,180 Location Central NY The return line check valve? I'm pretty sure it's 1/8" NPT
Jun 30, 2023 #3 The_Josh_Bear Full Access Member Joined Jun 1, 2016 Posts 1,956 Reaction score 1,531 Location Western WA I second that, 1/8" NPT