is that psi at the head or the main line? if at the head over pressure may be the trouble. the 1800's were designed to work at 30 psi so misting may be why they are falling short. some possible options are changing to streamer nozzles or switching to pressure regulated heads.

the screen does not pop up help me

Google is your friend. In 2 seconds, writing trundle bed with popup, this came up on the search: Foldingbed.net They sell the mattresses too, and delivery is free. https://foldingbed.net/Item/Pop-Up-Trundle-Bed?gclid=EAIaIQobChMIicuum-jP-wIVZhTUAR1bowq3EAQYBSABEgLbGfD_BwE Heavy Duty Adult Pop Up Trundle Bed Set 453114(LPFS)(Weight Capacity is 400 Lbs Per Bed) • Available in 39 In. Wide• Includes top spring (351), pop-up trundle (66) & 2 sq. tubular arms (48)• Universal brackets fit any daybed end 2-way adjustable maintains 15-1/4 bedding height• Reinforced Corners angle braces at all corners for increased strength.• Top Springs 38-1/2 In. x 76 In.- 77• Trundle: 38-1/2 In. x 72 In., Height: 15-1/4 In. elevated, Height: 4-1/2 In. collapsed Heavy Duty. Perfect for Adult's To be used with a regular Twin Mattress that are up to 8" thick. Both mattress should be the same thickness. The weight capacity for each bed is 400 Lbs of distributed weight. Mattress are not included in the price. You can purchase them below. The Pop Up part of the bed comes completely assembled. You just need to remove the packaging that protects it during transit. Touse the Pop Up. There is a bar running through the length of the bed. Lift that slightly and the under bed will then be able to be pushed down.The mattress will need to be on it to be able to engage the mechanism. Most Product Leave Our Warehouse Within 24 Hours. We are fully Insured, Licensed and Bonded. (Most Other Companies Are Not). In business for over 20 years. P.S. I think trundle beds are great, even for adults, and for your husband, if you want, you can have a wooden board cut to fit for under the mattress for extra support. If you want to use it as a daybed, get large pillows made that are half the length of the bed and put the bed against the wall. Have zip off washable covers made.

i am going to use them on an upcoming remodel. I think sometimes installers poo poo things that are difficult to install