Does the female portion of this item have FINE treads and the male portion to hook the hose to should be normal hose threads ?

Both are standard garden hose threads. (MHT Male hose thread)(FHT Female hose thread)

Can I use this for laundry tubs?

When the water pressure is shut off the excess water in the hose which would normally flow back into the hose instead comes out the small holes around the edge so I would not recommend using this anywhere you would want to stay dry.

I am looking for fine threads on the house side of the vacuum breaker and the course threads on the hose side. Does this one have that configuration?

Check out: SpigotMaster ~SM01 Vacuum Breaker Adapter~ Converts an Arrowhead PK1390 Anti-Siphon Valve Into a Straight Through Connection https://www.amazon.com/SpigotMaster-Adapter-Arrowhead-Anti-Siphon-Connection/dp/B07BD4H8RP/ref=cm_cr_arp_d_product_top?ie=UTF8

Does it include rubber washer?

mine shipped with a rubber washer

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💧 Protect your water, protect your home — the smart choice for savvy managers.

FREEZE SAFE DESIGN - Engineered exclusively for nonfreezing environments to ensure reliable performance year-round.
CONTAMINATION SHIELD - Prevents dangerous back siphonage, safeguarding your potable water supply with certified protection.
MANUAL DRAIN CONTROL - Includes a manual drain release valve to fully clear water and prevent freeze damage after use.
TRUSTED CERTIFICATION - I.A.P.M.O. and A.S.S.E. approved for guaranteed quality and peace of mind.
UNIVERSAL HOSE COMPATIBILITY - Seamlessly fits all standard 3/4'' hose thread outlets for effortless installation.

The Mueller/B & K 108-904RP Backflow Preventer-Vacuum Breaker is a certified plumbing safeguard designed for nonfreezing areas. It fits any 3/4'' hose thread outlet and prevents backflow contamination of potable water. Featuring a vandal-resistant lock screw and manual drain release, it ensures durable, reliable protection for indoor and outdoor hose connections.

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