Test cap unit for sealed fitting

In combination, for use with a work body wall having inner and outer sides, and an opening therethrough,

• a) a pipe fitting having an end wall and forming a port radially inwardly of the end wall to align with said wall opening,
• b) an annular elastomeric seal positioned to be compressed between said end wall and said work body wall for preventing leakage of fluid outwardly from said wall opening,
• c) a test cap unit spaced from said seal and aligned therewith to close off said opening,
• d) and fastener means extending through said cap unit and adjustably attached to said fitting for urging the cap unit into sealing relation with the inner side of said work body wall, about said opening, when said seal is compressed as aforesaid, whereby the cap unit then closes off said opening so that test liquid under pressure can be filled into said fitting to test for leakage,
• e) said cap unit having annular sealing means facing toward the annular seal for sealing engagement with said wall inner side, said sealing means comprising an elastomeric ring and said cap unit includes a plate carrying said ring, said ring consisting of resiliently deflectable material projecting from said plate.