if i need to request X-Over with BOX-BOX and i dont need the thread to be femal in the body of joint but pin thread with coupling how can i descripe it to be clear? i saw some connection box in the body of pipe directly but other box means pin thread with coupling.
for expample if i need 4 1/2 box vam top to 3 1/2 vam top how can i descpripe the specification?
you help guys pls.