CAST-A-SEAL 964 is the cast-in connector with big advantages. Casting mandrels for 48 manholes eliminate the time and expense of forming or coring holes while ensuring a watertight seal. The unique two-step design accommodates pipe from 4.21 OD to 6.9 OD, in either manhole or straight wall applications. CAST-A-SEAL 964 conforms fully with the requirements of ASTM C 923, ASTM C 1478, and ASTM C1644.