From Pumpsolutions

This kit will give you trouble free performance day in and out no matter what fluid you are pumping and keep your pump from failure if it happens to run dry without affecting the seal. Kit includes chamber, hose, expansion tank which is clear lucite for complete visibility. Also includes 1/2" liquid fill plug, air valve, and pressure gauge.
118.000.236........Purchase 1 or 2.......$416.00 each......Take All 6......$375.00 each