Vac relief valves, good prices

[ERV JR]

here are some versions of the releifs that gz sells, they sell the 3/8, but think they also used to sell the 1/4 npt for the smaller pumps but no reason you cant use one of these larger valves with a bigger pump. I may be making a billiet adapater to go directly to the pump and the valve screws into, like the moroso unit.
anyway these are alot cheaper and they aslo make a larger valve which can be used with a larger pump

Brass

Adjust these brass valves to relieve vacuum pressure from 0 to 27" Hg. They can also be configured to work as pressure-relief valves for low-pressure compressed air applications. Pressure adjusts from 0 to 20 psi with the knurled adjustment screw. They are not factory set to a specific pressure. Valves have a Type 302 stainless steel spring. The 1/4" pipe size valve has a metal-to-metal seal with a Type 440C stainless steel disc; 3/8" and 3/4" pipe size valves have a Buna-N seal with a nylon disc. Temperature range is -15° to +250° F. Connections: NPT male bottom inlet and vented top outlet.
Pipe Size Ht. Each

1/4" 1 3/4" 48935K25 $8.32

3/8" 2 1/16" 48935K35 14.62

3/4" 2 3/4" 48935K45 34.05

[a1elec]

thanks erv good info