If you need a fitting today, check the "Check Store Availability" feature on these sites before driving: 3/4" x 3/4" ProBite Straight Coupling [with stiffeners]
ProBite push-to-connect fittings are available primarily through and select nationwide big-box stores . Because they are a specialized alternative to brands like SharkBite, they are often easier to find on digital storefronts than in-stock at every local hardware shop. Top Online Retailers
2" ProBite Stiffener, Hi-Flo : Industrial & Scientific - Amazon.com