10004404CM (40DHD) by PT-Coupling | Heavy Duty Cam & Groove Adapter | Type DHD | 4" Coupler x 4" Female NPT | Aluminum | Buna-N SealFeatures & Applications: Lightweight and economical. Good abrasion resistance. Fair corrosion and chemical resistance. Use with water, hydraulic oil, coolants, gasoline, and petroleum products. 2 1 2" and smaller couplers come standard with 2 cam arms while 3" and larger couplers come with 4 STA LOK II cam arms. Made in the USA Part Name Item # Heavy Duty Coupler Female NPT Thread Max. Allowable Working Press. (PSI)* 15DHD 1000415H 1 1 2" 1 1 2" 500