I also came across these other fittings I also use, takes a little longer, but for an r290 system they might work better for you.

gohantee R12 R410 Refrigerant Charging Valve, R12 R22-1/4“ Male to 1/4” Female, R410-1/4" Male to 5/16" Female, Safety Adapter Flow Control Ball Valve for R12 R22 R410 Air Conditioner Manifold https://www.amazon.com/dp/B085W1R5TH/ref=cm_sw_r_cp_api_i_PDX7BJQ512JENXHG1B37?_encoding=UTF8&psc=1