with a plurality of holes 36 and 37 for permitting the temporary attachment of the anchor body 10 to form members while pouring and hardening of the surrounding concrete extending outwardly from the external wall 32 of the tubular member 22 and connected to the mounting flange 23 are reinforcing ribs 34 and 35 as shown in fig3 and 5 sealing cap 11 has a central cavity 17 a receiving collar 19 provides a close telescoping fit over and around the tubular member 21 such that in the assembled condition the inside wall 16 of the receiving collar 19 engages the external wall 32 of the tubular member 21 to help properly align the cap 11 in position within cavity 17 is provided an annular frusto conical sealing surface 18 correspondingly inclined to mate with shoulder 29 when the cap 11 is position as shown in fig5 a plurality of circumferentially spaced resilient locking fingers 15 provide a means for securing the sealing cap 11 to the tubular member 21 the locking fingers 15 being engagable with the shoulder in annular recess 27 in the preferred embodiment a plurality of guide fingers not shown are positioned between the locking fingers 15 guide fingers are adapted to telescope in a close fitting arrangement into bore 26 within the.