I am replacing the membrane on my Spectra Ventura 150 watermaker
after ~ 6 years of use. I believe it would be prudent to replace the O rings on the ends of the membrane housing. I priced them from the local Spectra dealer and they want $29.00 plus tax and shipping
for these 6 o rings. They appear to be 4mm x 58mm for the 2 big ones and 3mm x 19mm for the 4 smaller ones.
I can get o rings from my local industrial supply house for a fraction of the Spectra cost. Can anyone help me as to the material and hardness specs for these o rings. Buna-n, soft Buna-N, silicone, EPDM, Viton, etc.