Simpson Strong-Tie connectors make projects easier to build while making them stronger and safer. They are engineered and tested to perform and are manufactured to the highest quality standards. Whether working on a home project or building a structure to comply with building codes, go with the choice of engineers and contractors, go with genuine Simpson Strong-Tie connectors. PA/HPA purlin anchors offer solutions for wood to concrete and concrete block connections which satisfy code requirements. The PA's dual embedment line allows installation in concrete or concrete block.