I got a brass PRV from Wal-mart for less than $20. It seems to be working fine. It's rated for 50 psi and my pressure guage reads 50 psi exactly.
Cameron & the Labradors
Kai & Samm
North Vancouver, BC
AIR #11529 http://northvancouvermodern.blogspot.com/ Live! Life's a banquet and most poor suckers are starving to death! - Mame Dennis