What is a Caretaker THAK?

I know some parts on Caretaker's Catalogue say "Less Thak" or "Thak". This is not a common knowledge term so we are going to let you in on some industry lingo here. 

THAK = Test Housing Assembly Kit

This virtually means everything but the valve when referring to the Caretaker parts. 

Parts that include the THAK assembly are 5-9-2000

The THAK items include:

1 Bottom Plate(1-9-215)

2 Unions(4-1-2002)

1 V-Clamp(3-9-216)

1 Oring Kit(5-13-1)

1 Pressure Relief Valve(1-1-220)