The Cherne® Air-Loc® Joint Testers are designed to test large diameter, installed, pre-cast concrete pipe as described in ASTM C1103. Ready to test with water or air straight from Cherne’s factory—no modifications are needed—the Air-Loc® Joint Tester also allows you to pre-test before backfilling. Capable of testing to 10 psi air or 50 psi water. Cherne Industries is a global leader in pipe plug, blocking and testing.