Backflow prevention and method of manufacture

A method of replacing a backflow prevention assembly, the method comprising:

• removing an existing backflow prevention assembly from a fluid line, the existing backflow prevention assembly having an assembly length, the existing backflow prevention assembly including a backflow prevention valve having a valve length;
• receiving an assembled replacement backflow prevention assembly that has been certified by an outside certifying authority regarding operational capabilities of the replacement backflow prevention assembly, the replacement backflow prevention assembly having an assembly length that matches the assembly length of the existing backflow prevention assembly, the replacement backflow prevention assembly including
• an inlet shut-off valve,
• an outlet shut-off valve,
• a backflow prevention valve coupled to one of the inlet shut-off valve and the outlet shut-off valve, and
• a spool spacer coupled to the backflow prevention valve and one of the inlet shut-off valve and the outlet shut-off valve;
• and
• securing the replacement backflow prevention assembly to the fluid line.

A method of manufacturing a backflow prevention assembly, the method comprising:

• assembling a replacement backflow prevention assembly, wherein
• the replacement backflow prevention assembly includes an inlet shut-off valve, an outlet shut-off valve, a spool spacer, and a backflow prevention valve,
• the spool spacer and the backflow prevention valve are disposed between the inlet shutoff valve and the outlet shut-off valve,
• the backflow prevention valve has a valve length that is shorter than a valve length of a backflow prevention valve of an existing backflow prevention assembly, and
• the replacement backflow prevention assembly has an assembly length that matches an assembly length of the existing backflow prevention assembly;
• and
• obtaining certification from an outside certifying authority regarding operational capabilities of the replacement backflow prevention assembly.