Extending the grip length of the 302 & 370:

#37 screws on to the end of the 1/4" IPS end of the 302 or 370 fixtures.

an additional 1/4" nipple such as the #38 above can then be threaded into the

#37 coupling.

A 9/16" clearance hole is required for 1/4" IPS. If the #37 coupling is used,

a 5/8" or slightly larger is required to allow the #37 to pass through the hole.