Stub-up coupling system

A coupler for pipe comprising:

• a coupler body formed from a cylindrical wall enclosing a hollow interior divided into a first glue-hub extending inward from a first open end of the coupler body and a second glue-hub extending between the first glue-hub and a second end of the coupler body, the coupler body further includes a knock-out section extending from a distal end of the second glue-hub toward the second end of the coupler body, a diameter of an inner surface of the knock-out section is greater than a diameter of an inner surface of the second glue-hub such that a shoulder is formed between the inner surface of the knock-out section and the inner surface of the second glue-hub;
• a coupler knock-out member extends across and closes the second end of the coupler body and is connected to an inner surface of the coupler body along the knock-out section by a web of reduced thickness relative to the coupler knock-out member, wherein the first glue-hub is configured to receive an end of a first pipe and the second glue-hub is configured to receive an end of a second pipe when the coupler knock-out member has been removed from the second end of the coupler body;
• and
• a cap including a cylindrical wall enclosing a hollow interior, a first end of the cylindrical wall of the cap is open and a second end of the cylindrical wall is closed off by a cap knock-out member connected to the cylindrical wall by a web of reduced thickness relative to the cap knock-out member;
• an inner radial dimension of the cap is greater than an outer radial dimension of the coupler such that the coupler is insertable into the hollow interior of the cap through the first end of the cylindrical wall of the cap;
• a first mating feature is included on the coupler and a second mating feature is included on the cap, the first mating feature cooperating with the second mating feature to set a vertical position of the cap relative to the coupler with the coupler extending into the cap and such that the cap knock-out member is positioned in spaced relation above the coupler knock-out member.